How severe is CVE-2021-22893?

CVE-2021-22893 has a CVSS score of 10/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-22893?

Affected package information for CVE-2021-22893 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-22893?

No fixed version has been published for CVE-2021-22893 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-2021-22893 actively exploited in the wild?

Yes. There are 14 known exploit references for CVE-2021-22893, including 12 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-2021-22893?

CVE-2021-22893 has an EPSS (Exploit Prediction Scoring System) score of 93.6%, placing it in the 100th 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. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2021-22893 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-22893 (Ivanti Pulse Connect Secure Use-After-Free 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. This CVE has been used in known ransomware campaigns. 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-2021-22893?

CVE-2021-22893 is classified as Improper Authentication (CWE-287), Use After Free (CWE-416). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2021-22893?

CVE-2021-22893 affects ivanti connect secure (2 versions, e.g. 9.0, 9.1). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2021-22893 published, and has it been updated?

CVE-2021-22893 was published on April 23, 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 · Ransomware

CVE-2021-22893

CRITICAL

Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the Windows File Share Browser and Pulse Secure Collaboration features…

Published

Apr 23, 2021

Updated

Dec 18, 2025

Affected

0 pkgs

Patched

None yet

Exploits

14 known

EPSS Exploitation Probability

via FIRST.org ↗

93.6%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

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

Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the Windows File Share Browser and Pulse Secure Collaboration features of Pulse Connect Secure that can allow an unauthenticated user to perform remote arbitrary code execution on the Pulse Connect Secure gateway. This vulnerability has been exploited in the wild.

Affected Products

1 product · 36 configurations

Application

connect secureivanti

2 versions

9.09.1

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.