[ CVE-2021-31166 · Published 11 May 2021 ]
Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability
Exploited · CISA KEV CVSS 9.8
EPSS 100%Fix available
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-04-06
- EPSS: 100% chance of exploitation in the next 30 days (higher than 100% of CVEs)
- Critical severity: CVSS 9.8
[ Description ]Official description
HTTP Protocol Stack Remote Code Execution Vulnerability
CISA: Microsoft HTTP Protocol Stack contains a vulnerability in http.sys that allows for remote code execution.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 27 Apr 2022): Apply updates per vendor instructions.
- Patch on portal.msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ References ]References
- packetstormsecurity.com/files/162722/Microsoft-HTTP-Protocol-Stack-Remote-Code-Executio…Third Party AdvisoryVDB Entry
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31166PatchVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource