[ CVE-2021-36955 · Published 15 Sep 2021 ]
Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability
Exploited · CISA KEV CVSS 7.8
EPSS 4%Fix available
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2021-11-03
- Known to be used in ransomware campaigns
[ Description ]Official description
Windows Common Log File System Driver Elevation of Privilege Vulnerability
CISA: Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 17 Nov 2021): Apply updates per vendor instructions.
- Patch on msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on portal.msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ References ]References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36955PatchVendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36955PatchVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource