CVE-2021-34458: Microsoft Windows Server 2016

Critical severity, CVSS 9.9. EPSS: 2.6% chance of exploitation in the next 30 days.

Windows Kernel Remote Code Execution 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 2021-07-16. Last modified 2026-08-10.