CVE-2021-40450
Microsoft Windows 10 Version 1809, Microsoft Windows Server 2019, Microsoft Windows Server 2019 (Server Core installation)
Published 13 Oct 2021 · updated 17 Jun 2026 · Analyzed
7.8 High · CVSS 3.1, microsoft.com
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 25 Apr 2022, with a remediation deadline of 16 May 2022 for US federal agencies.
Required action: Apply updates per vendor instructions.
Description
Win32k Elevation of Privilege Vulnerability
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40450 · Patch, Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40450 · US Government Resource