CVE-2021-22893

Name: CVE-2021-22893
Creator: NVD / NIST
Published: 2021-04-23T17:15:08.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10Actively ExploitedEPSS 47.17%

Last modified Jun 17, 2026

CVE-2021-22893 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 47.17% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

10/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

47.17%

98.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ivanti	Connect Secure	9.0
Ivanti	Connect Secure	9.1

References

https://blog.pulsesecure.net/pulse-connect-secure-security-update/Vendor Advisory
https://kb.cert.org/vuls/id/213092Third Party Advisory, US Government Resource
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/Broken Link, Vendor Advisory
https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.htmlThird Party Advisory
https://blog.pulsesecure.net/pulse-connect-secure-security-update/Vendor Advisory
https://kb.cert.org/vuls/id/213092Third Party Advisory, US Government Resource
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/Broken Link, Vendor Advisory
https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.htmlThird Party Advisory
https://www.kb.cert.org/vuls/id/213092US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22893US Government Resource

Timeline

Published: Apr 23, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-22893?

How severe is CVE-2021-22893?

CVE-2021-22893 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 47.17% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-22893?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22893?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST