Known exploited vulnerability
CVE-2021-22893
The short answer
CVE-2021-22893 affects n/a Pulse Connect Secure and is rated critical (CVSS 10.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first.
What it is
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.
Severity
10.0 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Nov 3, 2021
Federal due date May 3, 2022
EPSS, next 30 days
48%
Higher than 99% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
Pulse Connect Secure. NVD's record lists the exact affected versions.
References
- blog.pulsesecure.net/pulse-connect-secure-security-update/ Vendor Advisory
- kb.cert.org/vuls/id/213092 Third Party AdvisoryUS Government Resource
- kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/ Broken LinkVendor Advisory
- www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html Third Party Advisory
- blog.pulsesecure.net/pulse-connect-secure-security-update/ Vendor Advisory
- kb.cert.org/vuls/id/213092 Third Party AdvisoryUS Government Resource
- kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/ Broken LinkVendor Advisory
- www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html Third Party Advisory
- www.kb.cert.org/vuls/id/213092 US Government Resource
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22893 US Government Resource
Questions
Is CVE-2021-22893 being exploited?
Yes. CISA added CVE-2021-22893 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2021-22893?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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