CVE-2021-43246: Microsoft Windows 10

Medium severity, CVSS 5.6. EPSS: 0.8% chance of exploitation in the next 30 days.

Windows Hyper-V Denial of Service Vulnerability

Affected products

• Microsoft Windows 10: version 20h2 only; version 21h1 only; version 21h2 only; version 1809 only; version 2004 only
• Microsoft Windows Server: version 20h2 only; version 2022 only
• Microsoft Windows Server 2016: version 2004 only
• Microsoft Windows Server 2019: affected versions not specified

Published 2021-12-15. Last modified 2026-06-17.