CVE-2021-33771
Microsoft Windows 10 Version 1507, Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809
Published 14 Jul 2021 · updated 10 Aug 2026 · Analyzed
7.8 High · CVSS 3.1, microsoft.com
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, with a remediation deadline of 17 Nov 2021 for US federal agencies.
Required action: Apply updates per vendor instructions.
Description
Windows Kernel Elevation of Privilege Vulnerability
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33771 · Patch, Vendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33771 · Patch, Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33771 · US Government Resource