What is CVE-2021-22893?

CVE-2021-22893 is a vulnerability in Pulse Connect Secure, classified under Improper Authentication. Published 2021-04-23.

Is CVE-2021-22893 known to be exploited?

Yes. CVE-2021-22893 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 29 public proof-of-concept repositories are indexed.

Auth bypass in Pulse Connect Secure

CVE-2021-22893

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…

Vulnerability class: Broken Authentication

EPSS: 0.936 (99.8th percentile) — read the EPSS interpretation.

Affected products

N/a Pulse Connect Secure — versions PCS 9.0R3 or above, PCS 9.1R1 and above

Weakness classification (CWE)

CWE-287 — Improper Authentication

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/ (x_refsource_MISC)
blog.pulsesecure.net/pulse-connect-secure-security-update/ (x_refsource_MISC)
www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypa… (x_refsource_MISC)
kb.cert.org/vuls/id/213092 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-22893?: CVE-2021-22893 is a vulnerability in Pulse Connect Secure, classified under Improper Authentication. Published 2021-04-23.
Is CVE-2021-22893 known to be exploited?: Yes. CVE-2021-22893 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 29 public proof-of-concept repositories are indexed.