Cisco flaws being used in attacks

CISA lists 101 flaws in Cisco products as being used in attacks, most recently on 14 Oct 2026. 7 have been used in ransomware.

What to do

1. Update every Cisco product you use.Install the updates Cisco offers, on every device, and restart when asked. Each flaw below has a fix or clear advice; that’s one of CISA’s conditions for listing it.
2. If someone looks after IT for you, send them this page.Many of these are in equipment you don’t see: routers, firewalls, servers, the office network. Ask them to confirm each one is fixed, or that you don’t use the product.
3. Check anything else in the lookup.Search any app, company or CVE. Not being on CISA’s list doesn’t mean safe: keep updating either way.

Every flaw, newest first

1. Being used in attacksAdded by CISA on 14 Oct 2026
   Cisco Secure Email Gateway
   CVE-2026-76519Cisco Secure Email Gateway Relative Path Traversal Vulnerability
   Cisco Secure Email Gateway contains a relative path traversal vulnerability that could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
2. Being used in attacksAdded by CISA on 30 Sep 2026
   Cisco Catalyst SD-WAN Manager
   CVE-2026-76504Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
   Cisco Catalyst SD-WAN Manager contains a hex encoding vulnerability that could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user due to improper handling of URI encoding in an HTTP request.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
3. Being used in attacksAdded by CISA on 16 Sep 2026
   Cisco Identity Services Engine
   CVE-2026-76460Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
   Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) contain an incorrect use of privileged APIs vulnerability that could allow an unauthenticated, remote attacker to gain unauthorized access to the affected device by bypassing the web-based management interface.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
4. Being used in attacksAdded by CISA on 14 Sep 2026
   Cisco Secure Email Gateway
   CVE-2026-76461Cisco Secure Email Gateway SQL Injection Vulnerability
   Cisco AsyncOS software for Cisco Secure Email Gateway (SEG) contains a SQL injection vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
5. Being used in attacksAdded by CISA on 9 Sep 2026
   Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management
   CVE-2026-20079Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
   Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain an authentication Bypass using an alternate path or channel vulnerability that could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
6. Being used in attacksAdded by CISA on 11 Aug 2026
   Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD)
   CVE-2026-20349Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability
   Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) contain a heap inspection vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
7. Being used in attacksUsed in ransomwareAdded by CISA on 29 Jul 2026
   Cisco Secure Firewall Management Center (FMC)
   CVE-2026-20316Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability
   Cisco Secure Firewall Management Center (FMC) formerly known as Firepower Management Center contains a use of hard-coded password vulnerability that could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
8. Being used in attacksAdded by CISA on 13 Jul 2026
   Cisco IOS
   CVE-2008-4128Cisco IOS Cross-Site Request Forgery Vulnerability
   Cisco IOS 12.4 contains multiple cross-site forgery vulnerabilities that allows remote attackers to execute arbitrary commands via (1) a certain "show privilege" command to the /level/15/exec/- URI, and (2) a certain "alias exec" command to the /level/15/exec/-/configure/http URI.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
9. Being used in attacksAdded by CISA on 25 Jun 2026
   Cisco Unified Communications Manager
   CVE-2026-20230Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability
   Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) contain a server-side request forgery (SSRF) Vulnerability that could allow an unauthenticated, remote attacker to write files to the underlying operating system that could be used later to elevate to root.
   CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

   Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
   CVE recordNVD
10. Being used in attacksAdded by CISA on 15 Jun 2026
    Cisco Catalyst SD-WAN Manager
    CVE-2026-20262Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability
    Cisco Catalyst SD-WAN Manager contains a directory or path traversal vulnerability that could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system.
    CISA’s required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Read all

    Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
    CVE recordNVD
11. Being used in attacksAdded by CISA on 9 Jun 2026
    Cisco Catalyst SD-WAN Manager
    CVE-2026-20245Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output Vulnerability
    Cisco Catalyst SD-WAN Manager formerly SD-WAN vManage contains an improper encoding or escaping of output vulnerability. This vulnerability could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
12. Being used in attacksAdded by CISA on 14 May 2026
    Cisco Catalyst SD-WAN
    CVE-2026-20182Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
    Cisco Catalyst SD-WAN Controller & Manager contain an authentication bypass vulnerability that allows an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.
    CISA’s required actionPlease adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Read all

    Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
13. Being used in attacksAdded by CISA on 20 Apr 2026
    Cisco Catalyst SD-WAN Manager
    CVE-2026-20133Cisco Catalyst SD-WAN Manager Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
    Cisco Catalyst SD-WAN Manager contains an exposure of sensitive information to an unauthorized actor vulnerability that could allow remote attackers to view sensitive information on affected systems.
    CISA’s required actionPlease adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Read all

    Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
14. Being used in attacksAdded by CISA on 20 Apr 2026
    Cisco Catalyst SD-WAN Manager
    CVE-2026-20128Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability
    Cisco Catalyst SD-WAN Manager contains a storing passwords in a recoverable format vulnerability that allows an authenticated, local attacker to gain DCA user privileges by accessing a credential file for the DCA user on the filesystem as a low-privileged user.
    CISA’s required actionPlease adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Read all

    Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
15. Being used in attacksAdded by CISA on 20 Apr 2026
    Cisco Catalyst SD-WAN Manger
    CVE-2026-20122Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability
    Cisco Catalyst SD-WAN Manager contains an incorrect use of privileged APIs vulnerability due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.
    CISA’s required actionPlease adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Read all

    Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
16. Being used in attacksUsed in ransomwareAdded by CISA on 19 Mar 2026
    Cisco Secure Firewall Management Center (FMC)
    CVE-2026-20131Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability
    Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain a deserialization of untrusted data vulnerability in the web-based management interface that could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
17. Being used in attacksAdded by CISA on 25 Feb 2026
    Cisco Catalyst SD-WAN Controller and Manager
    CVE-2026-20127Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability
    Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, contain an authentication bypass vulnerability could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.
    CISA’s required actionPlease adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Read all

    Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
18. Being used in attacksAdded by CISA on 25 Feb 2026
    Cisco SD-WAN
    CVE-2022-20775Cisco SD-WAN Path Traversal Vulnerability
    Cisco SD-WAN CLI contains a path traversal vulnerability that could allow an authenticated local attacker to gain elevated privileges via improper access controls on commands within the application CLI. A successful exploit could allow the attacker to execute arbitrary commands as the root user.
    CISA’s required actionPlease adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Read all

    Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
19. Being used in attacksAdded by CISA on 21 Jan 2026
    Cisco Unified Communications Manager
    CVE-2026-20045Cisco Unified Communications Products Code Injection Vulnerability
    Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance contain a code injection vulnerability that could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
20. Being used in attacksAdded by CISA on 17 Dec 2025
    Cisco Multiple Products
    CVE-2025-20393Cisco Multiple Products Improper Input Validation Vulnerability
    Cisco Secure Email Gateway, Secure Email, AsyncOS Software, and Web Manager appliances contains an improper input validation vulnerability that allows threat actors to execute arbitrary commands with root privileges on the underlying operating system of an affected appliance.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
21. Being used in attacksAdded by CISA on 29 Sep 2025
    Cisco IOS and IOS XE
    CVE-2025-20352Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
    Cisco IOS and IOS XE contains a stack-based buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) subsystem that could allow for denial of service or remote code execution. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
22. Being used in attacksAdded by CISA on 25 Sep 2025
    Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
    CVE-2025-20362Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability
    Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a missing authorization vulnerability. This vulnerability could be chained with CVE-2025-20333.
    CISA’s required actionThe KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Read all

    Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
23. Being used in attacksAdded by CISA on 25 Sep 2025
    Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
    CVE-2025-20333Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
    Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362.
    CISA’s required actionThe KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Read all

    Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
    CVE recordNVD
24. Being used in attacksAdded by CISA on 28 Jul 2025
    Cisco Identity Services Engine
    CVE-2025-20337Cisco Identity Services Engine Injection Vulnerability
    Cisco Identity Services Engine contains an injection vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC due to insufficient validation of user-supplied input allowing an attacker to exploit this vulnerability by submitting a crafted API request. Successful exploitation could allow an attacker to perform remote code execution and obtaining root privileges on an affected device.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
25. Being used in attacksAdded by CISA on 28 Jul 2025
    Cisco Identity Services Engine
    CVE-2025-20281Cisco Identity Services Engine Injection Vulnerability
    Cisco Identity Services Engine contains an injection vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC due to insufficient validation of user-supplied input allowing an attacker to exploit this vulnerability by submitting a crafted API request. Successful exploitation could allow an attacker to perform remote code execution and obtaining root privileges on an affected device.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
26. Being used in attacksAdded by CISA on 31 Mar 2025
    Cisco Smart Licensing Utility
    CVE-2024-20439Cisco Smart Licensing Utility Static Credential Vulnerability
    Cisco Smart Licensing Utility contains a static credential vulnerability that allows an unauthenticated, remote attacker to log in to an affected system and gain administrative credentials.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
27. Being used in attacksAdded by CISA on 3 Mar 2025
    Cisco Small Business RV Series Routers
    CVE-2023-20118Cisco Small Business RV Series Routers Command Injection Vulnerability
    Multiple Cisco Small Business RV Series Routers contains a command injection vulnerability in the web-based management interface. Successful exploitation could allow an authenticated, remote attacker to gain root-level privileges and access unauthorized data.
    CISA’s required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
28. Being used in attacksAdded by CISA on 12 Nov 2024
    Cisco Adaptive Security Appliance (ASA)
    CVE-2014-2120Cisco Adaptive Security Appliance (ASA) Cross-Site Scripting (XSS) Vulnerability
    Cisco Adaptive Security Appliance (ASA) contains a cross-site scripting (XSS) vulnerability in the WebVPN login page. This vulnerability allows remote attackers to inject arbitrary web script or HTML via an unspecified parameter.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
29. Being used in attacksAdded by CISA on 24 Oct 2024
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
    CVE-2024-20481Cisco ASA and FTD Denial-of-Service Vulnerability
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain a missing release of resource after effective lifetime vulnerability that could allow an unauthenticated, remote attacker to cause a denial-of-service (DoS) of the RAVPN service.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
30. Being used in attacksAdded by CISA on 2 Jul 2024
    Cisco NX-OS
    CVE-2024-20399Cisco NX-OS Command Injection Vulnerability
    Cisco NX-OS contains a command injection vulnerability in the command line interface (CLI) that could allow an authenticated, local attacker to execute commands as root on the underlying operating system of an affected device.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
31. Being used in attacksAdded by CISA on 24 Apr 2024
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
    CVE-2024-20359Cisco ASA and FTD Privilege Escalation Vulnerability
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain a privilege escalation vulnerability that can allow local privilege escalation from Administrator to root.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
32. Being used in attacksAdded by CISA on 24 Apr 2024
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
    CVE-2024-20353Cisco ASA and FTD Denial of Service Vulnerability
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
33. Being used in attacksUsed in ransomwareAdded by CISA on 15 Feb 2024
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
    CVE-2020-3259Cisco ASA and FTD Information Disclosure Vulnerability
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an information disclosure vulnerability. An attacker could retrieve memory contents on an affected device, which could lead to the disclosure of confidential information due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. This vulnerability affects only specific AnyConnect and WebVPN configurations.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
34. Being used in attacksAdded by CISA on 23 Oct 2023
    Cisco IOS XE Web UI
    CVE-2023-20273Cisco IOS XE Web UI Command Injection Vulnerability
    Cisco IOS XE contains a command injection vulnerability in the web user interface. When chained with CVE-2023-20198, the attacker can leverage the new local user to elevate privilege to root and write the implant to the file system. Cisco identified CVE-2023-20273 as the vulnerability exploited to deploy the implant. CVE-2021-1435, previously associated with the exploitation events, is no longer believed to be related to this activity.
    CISA’s required actionVerify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. Read all

    For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.
    CVE recordNVD
35. Being used in attacksAdded by CISA on 16 Oct 2023
    Cisco IOS XE Web UI
    CVE-2023-20198Cisco IOS XE Web UI Privilege Escalation Vulnerability
    Cisco IOS XE Web UI contains a privilege escalation vulnerability in the web user interface that could allow a remote, unauthenticated attacker to create an account with privilege level 15 access. The attacker can then use that account to gain control of the affected device.
    CISA’s required actionVerify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. Read all

    For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.
    CVE recordNVD
36. Being used in attacksAdded by CISA on 10 Oct 2023
    Cisco IOS and IOS XE
    CVE-2023-20109Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability
    Cisco IOS and IOS XE contain an out-of-bounds write vulnerability in the Group Encrypted Transport VPN (GET VPN) feature that could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute malicious code or cause a device to crash.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
37. Being used in attacksUsed in ransomwareAdded by CISA on 13 Sep 2023
    Cisco Adaptive Security Appliance and Firepower Threat Defense
    CVE-2023-20269Cisco Adaptive Security Appliance and Firepower Threat Defense Unauthorized Access Vulnerability
    Cisco Adaptive Security Appliance and Firepower Threat Defense contain an unauthorized access vulnerability that could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations or establish a clientless SSL VPN session with an unauthorized user.
    CISA’s required actionApply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices.
    CVE recordNVD
38. Being used in attacksAdded by CISA on 19 May 2023
    Cisco IOS, IOS XR, and IOS XE
    CVE-2016-6415Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability
    Cisco IOS, IOS XR, and IOS XE contain insufficient condition checks in the part of the code that handles Internet Key Exchange version 1 (IKEv1) security negotiation requests. contains an information disclosure vulnerability in the Internet Key Exchange version 1 (IKEv1) that could allow an attacker to retrieve memory contents. Successful exploitation could allow the attacker to retrieve memory contents, which can lead to information disclosure.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
39. Being used in attacksAdded by CISA on 19 May 2023
    Cisco IOS
    CVE-2004-1464Cisco IOS Denial-of-Service Vulnerability
    Cisco IOS contains an unspecified vulnerability that may block further telnet, reverse telnet, Remote Shell (RSH), Secure Shell (SSH), and in some cases, Hypertext Transport Protocol (HTTP) access to the Cisco device.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
40. Being used in attacksAdded by CISA on 19 Apr 2023
    Cisco IOS and IOS XE Software
    CVE-2017-6742Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
41. Being used in attacksUsed in ransomwareAdded by CISA on 24 Oct 2022
    Cisco AnyConnect Secure
    CVE-2020-3433Cisco AnyConnect Secure Mobility Client for Windows DLL Hijacking Vulnerability
    Cisco AnyConnect Secure Mobility Client for Windows interprocess communication (IPC) channel allows for insufficient validation of resources that are loaded by the application at run time. An attacker with valid credentials on Windows could execute code on the affected machine with SYSTEM privileges.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
42. Being used in attacksUsed in ransomwareAdded by CISA on 24 Oct 2022
    Cisco AnyConnect Secure
    CVE-2020-3153Cisco AnyConnect Secure Mobility Client for Windows Uncontrolled Search Path Vulnerability
    Cisco AnyConnect Secure Mobility Client for Windows allows for incorrect handling of directory paths. An attacker with valid credentials on Windows would be able to copy malicious files to arbitrary locations with system level privileges. This could include DLL pre-loading, DLL hijacking, and other related attacks.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
43. Being used in attacksAdded by CISA on 8 Jun 2022
    Cisco RV Series Routers
    CVE-2019-15271Cisco RV Series Routers Deserialization of Untrusted Data Vulnerability
    A deserialization of untrusted data vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an attacker to execute code with root privileges.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
44. Being used in attacksAdded by CISA on 24 May 2022
    Cisco Adaptive Security Appliance (ASA)
    CVE-2016-6367Cisco Adaptive Security Appliance (ASA) CLI Remote Code Execution Vulnerability
    A vulnerability in the command-line interface (CLI) parser of Cisco ASA software could allow an authenticated, local attacker to create a denial-of-service (DoS) condition or potentially execute code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
45. Being used in attacksAdded by CISA on 24 May 2022
    Cisco Adaptive Security Appliance (ASA)
    CVE-2016-6366Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
    A buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) code of Cisco ASA software could allow an attacker to cause a reload of the affected system or to remotely execute code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
46. Being used in attacksAdded by CISA on 23 May 2022
    Cisco IOS XR
    CVE-2022-20821Cisco IOS XR Open Port Vulnerability
    Cisco IOS XR software health check opens TCP port 6379 by default on activation. An attacker can connect to the Redis instance on the open port and allow access to the Redis instance that is running within the NOSi container.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
47. Being used in attacksAdded by CISA on 25 Mar 2022
    Cisco Secure Access Control System (ACS)
    CVE-2018-0147Cisco Secure Access Control System Java Deserialization Vulnerability
    A vulnerability in Java deserialization used by Cisco Secure Access Control System (ACS) could allow an unauthenticated, remote attacker to execute arbitrary commands on an affected device. The vulnerability is due to insecure deserialization of user-supplied content by the affected software.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
48. Being used in attacksAdded by CISA on 25 Mar 2022
    Cisco VPN Routers
    CVE-2018-0125Cisco VPN Routers Remote Code Execution Vulnerability
    A vulnerability in the web interface of the Cisco VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary code as root and gain full control of an affected system.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
49. Being used in attacksAdded by CISA on 25 Mar 2022
    Cisco IOS and IOS XE
    CVE-2017-3881Cisco IOS and IOS XE Remote Code Execution Vulnerability
    A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
50. Being used in attacksAdded by CISA on 25 Mar 2022
    Cisco Prime Data Center Network Manager (DCNM)
    CVE-2015-0666Cisco Prime Data Center Network Manager (DCNM) Directory Traversal Vulnerability
    Directory traversal vulnerability in the fmserver servlet in Cisco Prime Data Center Network Manager (DCNM) allows remote attackers to read arbitrary files.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
51. Being used in attacksAdded by CISA on 25 Mar 2022
    Cisco IOS XR
    CVE-2010-3035Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
    Cisco IOS XR, when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
52. Being used in attacksAdded by CISA on 25 Mar 2022
    Cisco IOS XR
    CVE-2009-2055Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
    Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
53. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers
    CVE-2022-20708Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
    A vulnerability in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following: Execute arbitrary code elevate privileges, execute arbitrary commands, bypass authentication and authorization protections, fetch and run unsigned software, or cause a denial of service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
54. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers
    CVE-2022-20703Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
    A vulnerability in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following: Execute arbitrary code elevate privileges, execute arbitrary commands, bypass authentication and authorization protections, fetch and run unsigned software, or cause a denial of service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
55. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers
    CVE-2022-20701Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
    A vulnerability in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following: Execute arbitrary code elevate privileges, execute arbitrary commands, bypass authentication and authorization protections, fetch and run unsigned software, or cause a denial of service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
56. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers
    CVE-2022-20700Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
    A vulnerability in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following: Execute arbitrary code elevate privileges, execute arbitrary commands, bypass authentication and authorization protections, fetch and run unsigned software, or cause a denial of service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
57. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers
    CVE-2022-20699Cisco Small Business RV Series Routers Stack-based Buffer Overflow Vulnerability
    A vulnerability in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following: Execute arbitrary code elevate privileges, execute arbitrary commands, bypass authentication and authorization protections, fetch and run unsigned software, or cause a denial of service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
58. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Small Business RV320 and RV325 Dual Gigabit WAN VPN Routers
    CVE-2019-1652Cisco Small Business Routers Improper Input Validation Vulnerability
    A vulnerability in the web-based management interface of Cisco Small Business RV320 and RV325 Dual Gigabit WAN VPN Routers could allow an authenticated, remote attacker with administrative privileges on an affected device to execute arbitrary commands.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
59. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS Software
    CVE-2018-0180Cisco IOS Software Denial-of-Service Vulnerability
    A vulnerability in the Login Enhancements (Login Block) feature of Cisco IOS Software could allow an unauthenticated, remote attacker to trigger a reload of an affected system, resulting in a denial of service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
60. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS Software
    CVE-2018-0179Cisco IOS Software Denial-of-Service Vulnerability
    A vulnerability in the Login Enhancements (Login Block) feature of Cisco IOS Software could allow an unauthenticated, remote attacker to trigger a reload of an affected system, resulting in a denial of service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
61. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS, XR, and XE Software
    CVE-2018-0175Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability
    Format string vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges on an affected device.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
62. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS XE Software
    CVE-2018-0174Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability
    A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow for denial-of-service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
63. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2018-0173Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
    A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets can allow for denial-of-service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
64. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2018-0172Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
    A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow for denial-of-service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
65. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS, XR, and XE Software
    CVE-2018-0167Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability
    There is a buffer overflow vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software which could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
66. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS Software
    CVE-2018-0161Cisco IOS Software Resource Management Errors Vulnerability
    A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could allow an authenticated, remote attacker to cause a denial-of-service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
67. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS Software and Cisco IOS XE Software
    CVE-2018-0159Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability
    A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial-of-service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
68. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS Software and Cisco IOS XE Software
    CVE-2018-0158Cisco IOS and XE Software Internet Key Exchange Memory Leak Vulnerability
    A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial-of-service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
69. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS Software and Cisco IOS XE Software
    CVE-2018-0156Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability
    A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial-of-service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
70. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches
    CVE-2018-0155Cisco Catalyst Bidirectional Forwarding Detection Denial-of-Service Vulnerability
    A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to cause a crash of the iosd process, causing a denial-of-service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
71. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS Software
    CVE-2018-0154Cisco IOS Software Integrated Services Module for VPN Denial-of-Service Vulnerability
    A vulnerability in the crypto engine of the Cisco Integrated Services Module for VPN (ISM-VPN) running Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial-of-service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
72. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2018-0151Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerability
    A vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
73. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS XE Software
    CVE-2017-12319Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability
    A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
74. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-12240Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability
    The Dynamic Host Configuration Protocol (DHCP) relay subsystem of Cisco IOS and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
75. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco Catalyst 6800 Series Switches
    CVE-2017-12238Cisco Catalyst 6800 Series Switches VPLS Denial-of-Service Vulnerability
    A vulnerability in the Virtual Private LAN Service (VPLS) code of Cisco IOS for Cisco Catalyst 6800 Series Switches could allow an unauthenticated, adjacent attacker to cause a denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
76. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-12237Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability
    A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS and Cisco IOS XE could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads to a denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
77. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS software
    CVE-2017-12235Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service Vulnerability
    A vulnerability in the implementation of the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
78. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS software
    CVE-2017-12234Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Vulnerability
    There is a vulnerability in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
79. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS software
    CVE-2017-12233Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Vulnerability
    There is a vulnerability in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
80. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS software
    CVE-2017-12232Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability
    A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
81. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS software
    CVE-2017-12231Cisco IOS Software Network Address Translation Denial-of-Service Vulnerability
    A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS could allow an unauthenticated, remote attacker to cause a denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
82. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS software
    CVE-2017-6744Cisco IOS Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS 1 contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
83. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6743Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
84. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6740Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
85. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6739Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
86. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6738Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
87. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6737Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
88. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6736Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
89. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6663Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability
    A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in denial-of-service (DoS).
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
90. Being used in attacksAdded by CISA on 3 Mar 2022
    Cisco IOS and IOS XE Software
    CVE-2017-6627Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability
    A vulnerability in the UDP processing code of Cisco IOS and IOS XE could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and denial of service.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
91. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco HyperFlex HX
    CVE-2021-1498Cisco HyperFlex HX Data Platform Command Injection Vulnerability
    Cisco HyperFlex HX Installer Virtual Machine contains an insufficient input validation vulnerability which could allow an attacker to execute commands on an affected device as the tomcat8 user.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
92. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco HyperFlex HX
    CVE-2021-1497Cisco HyperFlex HX Installer Virtual Machine Command Injection Vulnerability
    Cisco HyperFlex HX Installer Virtual Machine contains an insufficient input validation vulnerability which could allow an attacker to execute commands on an affected device as the root user.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
93. Being used in attacksUsed in ransomwareAdded by CISA on 3 Nov 2021
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
    CVE-2020-3580Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an insufficient input validation vulnerability for user-supplied input by the web services interface. Successful exploitation could allow an attacker to perform cross-site scripting (XSS) in the context of the interface or access sensitive browser-based information.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
94. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco IOS XR
    CVE-2020-3569Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
    Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
95. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco IOS XR
    CVE-2020-3566Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
    Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
96. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
    CVE-2020-3452Cisco ASA and FTD Read-Only Path Traversal Vulnerability
    Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an improper input validation vulnerability when HTTP requests process URLs. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
97. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco IP Phones
    CVE-2020-3161Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability
    Cisco IP Phones contain an improper input validation vulnerability for HTTP requests. Exploitation could allow an attacker to execute code remotely with root privileges or cause a denial-of-service (DoS) condition.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
98. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco IOS XR
    CVE-2020-3118Cisco IOS XR Software Discovery Protocol Format String Vulnerability
    Cisco IOS XR improperly validates string input from certain fields in Cisco Discovery Protocol messages. Exploitation could allow an unauthenticated, adjacent attacker to execute code with administrative privileges or cause a reload on an affected device.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
99. Being used in attacksAdded by CISA on 3 Nov 2021
    Cisco Small Business RV320 and RV325 Routers
    CVE-2019-1653Cisco Small Business RV320 and RV325 Routers Information Disclosure Vulnerability
    Cisco Small Business RV320 and RV325 Dual Gigabit WAN VPN Routers contain improper access controls for URLs. Exploitation could allow an attacker to download the router configuration or detailed diagnostic information.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
100. Being used in attacksAdded by CISA on 3 Nov 2021
     Cisco Adaptive Security Appliance (ASA)
     CVE-2018-0296Cisco Adaptive Security Appliance (ASA) Denial-of-Service Vulnerability
     Cisco Adaptive Security Appliance (ASA) contains an improper input validation vulnerability with HTTP URLs. Exploitation could allow an attacker to cause a denial-of-service (DoS) condition or information disclosure.
     CISA’s required actionApply updates per vendor instructions.
     CVE recordNVD
101. Being used in attacksAdded by CISA on 3 Nov 2021
     Cisco IOS and IOS XE
     CVE-2018-0171Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerability
     Cisco IOS and IOS XE Software improperly validates packet data, allowing an unauthenticated, remote attacker to trigger a reload of an affected device, cause a denial-of-service (DoS) condition, or perform code execution on the affected device.
     CISA’s required actionApply updates per vendor instructions.
     CVE recordNVD

From CISA’s Known Exploited Vulnerabilities catalog, updated 21 Oct 2026 (version 2026.10.21). CISA’s required actions are written for US government agencies. Cisco on CISA’s site.