CVE-2021-1691: Microsoft Windows 10

High severity, CVSS 7.7. EPSS: 4.1% chance of exploitation in the next 30 days.

Windows Hyper-V Denial of Service Vulnerability

Affected products

• Microsoft Windows 10: version 20h2 only; version 1909 only; version 2004 only
• Microsoft Windows Server 2016: version 20h2 only; version 1909 only; version 2004 only

Published 2021-01-12. Last modified 2026-06-17.