CVE-2021-26867: Microsoft Windows 10

Critical severity, CVSS 9.9. EPSS: 2.8% chance of exploitation in the next 30 days.

Windows Hyper-V Remote Code Execution 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 2021-03-11. Last modified 2026-08-19.