CVE-2021-33779: Microsoft Windows Server 2016

High severity, CVSS 8.1. EPSS: 2.4% chance of exploitation in the next 30 days.

Windows AD FS Security Feature Bypass Vulnerability

Affected products

• Microsoft Windows Server 2016: affected versions not specified; version 20h2 only; version 2004 only
• Microsoft Windows Server 2019: affected versions not specified

Published 2021-07-14. Last modified 2026-08-10.