Citrix flaws being used in attacks

CISA lists 27 flaws in Citrix products as being used in attacks, most recently on 4 Oct 2026. 7 have been used in ransomware.

What to do

1. Update every Citrix product you use.Install the updates Citrix 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 4 Oct 2026
   Citrix NetScaler
   CVE-2026-88779Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
   Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.
   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 27 Sep 2026
   Citrix NetScaler
   CVE-2026-88772Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
   Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service
   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 27 Sep 2026
   Citrix NetScaler
   CVE-2026-88771Citrix NetScaler Improper Input Validation Vulnerability
   Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.
   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 9 Sep 2026
   Citrix NetScaler
   CVE-2026-19490Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
   Citrix NetScaler ADC and NetScaler Gateway contain an authentication-bypass vulnerability involving an alternate path or channel. When the NetScaler appliance is configured as an AAA virtual server or as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy), an unauthenticated remote threat actor may be able to bypass authentication.
   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 26 Aug 2026
   Citrix NetScaler ADC and NetScaler Gateway
   CVE-2026-8452Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
   Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability which could lead to denial of service.
   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 30 Mar 2026
   Citrix NetScaler
   CVE-2026-3055Citrix NetScaler Out-of-Bounds Read Vulnerability
   Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.
   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
7. Being used in attacksAdded by CISA on 26 Aug 2025
   Citrix NetScaler
   CVE-2025-7775Citrix NetScaler Memory Overflow Vulnerability
   Citrix NetScaler ADC and NetScaler Gateway contain a memory overflow vulnerability that could allow for remote code execution and/or denial of service.
   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
8. Being used in attacksAdded by CISA on 25 Aug 2025
   Citrix Session Recording
   CVE-2024-8069Citrix Session Recording Deserialization of Untrusted Data Vulnerability
   Citrix Session Recording contains a deserialization of untrusted data vulnerability that allows limited remote code execution with privilege of a NetworkService Account access. Attacker must be an authenticated user on the same intranet as the session recording server.
   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
9. Being used in attacksAdded by CISA on 25 Aug 2025
   Citrix Session Recording
   CVE-2024-8068Citrix Session Recording Improper Privilege Management Vulnerability
   Citrix Session Recording contains an improper privilege management vulnerability that could allow for privilege escalation to NetworkService Account access. An attacker must be an authenticated user in the same Windows Active Directory domain as the session recording server domain.
   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
10. Being used in attacksUsed in ransomwareAdded by CISA on 10 Jul 2025
    Citrix NetScaler ADC and Gateway
    CVE-2025-5777Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
    Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
    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
11. Being used in attacksAdded by CISA on 30 Jun 2025
    Citrix NetScaler ADC and Gateway
    CVE-2025-6543Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
    Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
    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 17 Jan 2024
    Citrix NetScaler ADC and NetScaler Gateway
    CVE-2023-6549Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
    Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for a denial-of-service when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
13. Being used in attacksAdded by CISA on 17 Jan 2024
    Citrix NetScaler ADC and NetScaler Gateway
    CVE-2023-6548Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability
    Citrix NetScaler ADC and NetScaler Gateway contain a code injection vulnerability that allows for authenticated remote code execution on the management interface with access to NSIP, CLIP, or SNIP.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
14. Being used in attacksUsed in ransomwareAdded by CISA on 18 Oct 2023
    Citrix NetScaler ADC and NetScaler Gateway
    CVE-2023-4966Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
    Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
    CISA’s required actionApply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
15. Being used in attacksAdded by CISA on 16 Aug 2023
    Citrix Content Collaboration
    CVE-2023-24489Citrix Content Collaboration ShareFile Improper Access Control Vulnerability
    Citrix Content Collaboration contains an improper access control vulnerability that could allow an unauthenticated attacker to remotely compromise customer-managed ShareFile storage zones controllers.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
16. Being used in attacksUsed in ransomwareAdded by CISA on 19 Jul 2023
    Citrix NetScaler ADC and NetScaler Gateway
    CVE-2023-3519Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability
    Citrix NetScaler ADC and NetScaler Gateway contains a code injection vulnerability that allows for unauthenticated remote code execution.
    CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
    CVE recordNVD
17. Being used in attacksAdded by CISA on 13 Dec 2022
    Citrix Application Delivery Controller (ADC) and Gateway
    CVE-2022-27518Citrix Application Delivery Controller (ADC) and Gateway Authentication Bypass Vulnerability
    Citrix Application Delivery Controller (ADC) and Gateway, when configured with SAML SP or IdP configuration, contain an authentication bypass vulnerability that allows an attacker to execute code as administrator.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
18. Being used in attacksUsed in ransomwareAdded by CISA on 25 Mar 2022
    Citrix ShareFile
    CVE-2021-22941Citrix ShareFile Improper Access Control Vulnerability
    Improper Access Control in Citrix ShareFile storage zones controller may allow an unauthenticated attacker to remotely compromise the storage zones controller.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
19. Being used in attacksAdded by CISA on 25 Mar 2022
    Citrix SD-WAN and NetScaler
    CVE-2019-12991Citrix SD-WAN and NetScaler Command Injection Vulnerability
    Authenticated Command Injection in Citrix SD-WAN Appliance and NetScaler SD-WAN Appliance.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
20. Being used in attacksAdded by CISA on 25 Mar 2022
    Citrix SD-WAN and NetScaler
    CVE-2019-12989Citrix SD-WAN and NetScaler SQL Injection Vulnerability
    Citrix SD-WAN and NetScaler SD-WAN allow SQL Injection.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
21. Being used in attacksAdded by CISA on 25 Mar 2022
    Citrix NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server
    CVE-2017-6316Citrix Multiple Products Remote Code Execution Vulnerability
    A vulnerability has been identified in the management interface of Citrix NetScaler SD-WAN Enterprise and Standard Edition and Citrix CloudBridge Virtual WAN Edition that could result in an unauthenticated, remote attacker being able to execute arbitrary code as a root user. This vulnerability also affects XenMobile Server.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
22. Being used in attacksAdded by CISA on 3 Nov 2021
    Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
    CVE-2020-8196Citrix ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure Vulnerability
    Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an information disclosure vulnerability.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
23. Being used in attacksAdded by CISA on 3 Nov 2021
    Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
    CVE-2020-8195Citrix ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure Vulnerability
    Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an information disclosure vulnerability.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
24. Being used in attacksAdded by CISA on 3 Nov 2021
    Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
    CVE-2020-8193Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass Vulnerability
    Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an authorization bypass vulnerability that may allow unauthenticated access to certain URL endpoints. The attacker must have access to the NetScaler IP (NSIP) in order to perform exploitation.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
25. Being used in attacksUsed in ransomwareAdded by CISA on 3 Nov 2021
    Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
    CVE-2019-19781Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability
    Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an unspecified vulnerability that could allow an unauthenticated attacker to perform code execution.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
26. Being used in attacksUsed in ransomwareAdded by CISA on 3 Nov 2021
    Citrix StoreFront Server
    CVE-2019-13608Citrix StoreFront Server XML External Entity (XXE) Processing Vulnerability
    Citrix StoreFront Server contains an XML External Entity (XXE) processing vulnerability that may allow an unauthenticated attacker to retrieve potentially sensitive information.
    CISA’s required actionApply updates per vendor instructions.
    CVE recordNVD
27. Being used in attacksUsed in ransomwareAdded by CISA on 3 Nov 2021
    Citrix Workspace Application and Receiver for Windows
    CVE-2019-11634Citrix Workspace Application and Receiver for Windows Remote Code Execution Vulnerability
    Citrix Workspace Application and Receiver for Windows contains remote code execution vulnerability resulting from local drive access preferences not being enforced into the clients' local drives.
    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. Citrix on CISA’s site.