CVE-2021-27063: Microsoft Windows Server 2008

High severity, CVSS 7.5. EPSS: 6.7% chance of exploitation in the next 30 days.

Windows DNS Server Denial of Service Vulnerability

Affected products

• Microsoft Windows Server 2008: version r2 only; version sp2 only
• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: affected versions not specified; version 20h2 only; version 1909 only; version 2004 only
• Microsoft Windows Server 2019: affected versions not specified

Published 2021-03-11. Last modified 2026-08-19.