CVE-2021-28310: Microsoft Win32k Privilege Escalation Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 8.4% chance of exploitation in the next 30 days.

Win32k Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 1803: affected versions not specified
• Microsoft Windows 10 1809: affected versions not specified
• Microsoft Windows 10 1909: affected versions not specified
• Microsoft Windows 10 2004: affected versions not specified
• Microsoft Windows 10 20h2: affected versions not specified
• Microsoft Windows Server 1909: affected versions not specified
• Microsoft Windows Server 2004: affected versions not specified
• Microsoft Windows Server 2019: affected versions not specified
• Microsoft Windows Server 20h2: affected versions not specified

Published 2021-04-13. Last modified 2026-06-17.