CVE-2024-21887
CVE-2024-21887 is a security flaw in Ivanti Connect Secure and Policy Secure, a VPN companies use to let staff in from outside. Attackers can run their own code on Ivanti Connect Secure and Policy Secure. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 10 Jan 2024, and says ransomware gangs have used it.[1]
Ivanti Connect Secure and Policy Secure is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Ivanti has published a fix or advice.
Description
CISA calls it a command injection in Ivanti Connect Secure and Policy Secure. In its words: “Ivanti Connect Secure (ICS, formerly known as Pulse Connect Secure) and Ivanti Policy Secure contain a command injection vulnerability in the web components of these products, which can allow an authenticated administrator to send crafted requests to execute code on affected appliances. This vulnerability can be leveraged in conjunction with CVE-2023-46805, an authenticated bypass issue.”[1]
The underlying weakness is command injection (CWE-77), in MITRE’s list of common software weaknesses.[2]
It scores 9.1 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; Ivanti’s advisory has them[3]. CISA names the product as Ivanti Connect Secure and Policy Secure.
Most families won’t have Ivanti Connect Secure and Policy Secure; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 10 Jan 2024. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 22 Jan 2024 to fix it.[1] CISA says ransomware gangs have used it.
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at over 99%. That’s in the top 1% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Ivanti has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.Ivanti Connect Secure and Policy Secure is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 22 Jan 2024 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| CISA adds it to its catalog of flaws known to be used in attacks, noting that ransomware gangs have used it.[1] | |
| The flaw is made public in the National Vulnerability Database, with a severity score of 9.1.[2] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at over 99%.[4] |
See also
Other Ivanti Connect Secure and Policy Secure flaws
- CVE-2023-46805: authentication bypass ·
Other Ivanti flaws
- CVE-2026-118527, Ivanti Connect Secure: generation of predictable numbers or identifiers ·
- CVE-2026-111357, Ivanti Connect Secure: missing authentication for critical function ·
- CVE-2026-104935, Ivanti Connect Secure: authentication bypass by spoofing ·
- CVE-2026-10520, Ivanti Sentry: OS command injection ·
- CVE-2026-6973, Ivanti Endpoint Manager Mobile (EPMM): improper input validation ·
Other command injection flaws
- CVE-2026-105134, AhsayCBS: command injection ·
- CVE-2026-96951, Microsoft Windows: command injection ·
- CVE-2016-3081, Apache Struts: command injection ·
- CVE-2026-8037, Progress LoadMaster: command injection ·
- CVE-2025-29635, D-Link DIR-823X: command injection ·
Added the same day
- CVE-2023-46805, Ivanti Connect Secure and Policy Secure: authentication bypass ·
- CVE-2023-29357, Microsoft SharePoint Server: privilege escalation ·
Every Ivanti flaw on CISA’s list · Everything added in January 2024
References
- ^ Cybersecurity and Infrastructure Security Agency. “Ivanti Connect Secure and Policy Secure Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 10 Jan 2024.
- ^ National Institute of Standards and Technology. “CVE-2024-21887 Detail”. National Vulnerability Database, published 12 Jan 2024.
- ^ Ivanti. Advisories and fixes: forums.ivanti.com, forums.ivanti.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 1.000, percentile 100.0, 31 Oct 2026.
- CVE Program. “CVE-2024-21887”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.