CVE-2021-42291: Microsoft Windows Server

High severity, CVSS 7.5. EPSS: 4.2% chance of exploitation in the next 30 days.

Active Directory Domain Services Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows Server: version 20h2 only; version 2012 only
• Microsoft Windows Server 2008: affected versions not specified; version r2 only
• Microsoft Windows Server 2012: affected versions not specified
• Microsoft Windows Server 2016: affected versions not specified; version 2004 only
• Microsoft Windows Server 2019: affected versions not specified
• Microsoft Windows Server 2022: any version

Published 2021-11-10. Last modified 2026-08-19.