# CVE-2021-22893: Ivanti Pulse Connect Secure Use-After-Free Vulnerability

> CVE-2021-22893: Ivanti Pulse Connect Secure Use-After-Free Vulnerability. CVSS 10.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-22893
Last updated: 2026-08-12T03:55:19Z

- Published: 2021-04-23 16:29 UTC · Updated: 2026-08-12 03:55 UTC · Assigner: hackerone
- CVSS: 10.0 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS: 47.2%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Known
- CWE: CWE-287

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- n/a: Pulse Connect Secure

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-22893)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-22893)
- [https://blog.pulsesecure.net/pulse-connect-secure-security-update/](https://blog.pulsesecure.net/pulse-connect-secure-security-update/)
- [https://kb.cert.org/vuls/id/213092](https://kb.cert.org/vuls/id/213092)
- [https://kb.pulsesecure.net/articles/Pulse\_Security\_Advisories/SA44784/](https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/)
- [https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html](https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-22893 · Markdown: https://rewindex.com/cve/CVE-2021-22893.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-22893 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:16.987Z