How severe is CVE-2021-22900?

CVE-2021-22900 has a CVSS score of 7.2/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-22900?

Affected package information for CVE-2021-22900 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-22900?

No fixed version has been published for CVE-2021-22900 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-22900 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2021-22900, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-22900?

CVE-2021-22900 has an EPSS (Exploit Prediction Scoring System) score of 2.6%, placing it in the 86th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2021-22900 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-22900 (Ivanti Pulse Connect Secure Unrestricted File Upload Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2021-22900?

CVE-2021-22900 is classified as Code Injection (CWE-94), CWE-669 (CWE-669). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2021-22900?

CVE-2021-22900 affects ivanti connect secure (2 versions, e.g. 9.0, 9.1); pulsesecure pulse connect secure. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2021-22900 published, and has it been updated?

CVE-2021-22900 was published on May 27, 2021 and was last updated on December 18, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2022-05-03

CVE-2021-22900

HIGH

A vulnerability allowed multiple unrestricted uploads in Pulse Connect Secure before 9.1R11.4 that could lead to an authenticated administrator to perform a file write via a maliciously…

Published

May 27, 2021

Updated

Dec 18, 2025

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

2.6%probability of exploitation in next 30 days

Lower Risk86th percentile+1.58%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

A vulnerability allowed multiple unrestricted uploads in Pulse Connect Secure before 9.1R11.4 that could lead to an authenticated administrator to perform a file write via a maliciously crafted archive upload in the administrator web interface.

Affected Products

2 products · 41 configurations

Application

connect secureivanti

2 versions

9.09.1

Application

pulse connect securepulsesecure

≤ 9.1

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A vulnerability allowed multiple unrestricted uploads in Pulse Connect S…

cisa.govCISANov 2021

A vulnerability allowed multiple unrestricted uploads in Pulse Connect S…

tenable.comAPIApr 2021

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-22900 in your stack?

O3 detects CVE-2021-22900 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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