CVE-2025-29955: Microsoft Windows 11 24h2

Medium severity, CVSS 5.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Improper input validation in Windows Hyper-V allows an unauthorized attacker to deny service locally.

Affected products

• Microsoft Windows 11 24h2: before 10.0.26100.4061 (fixed in 10.0.26100.4061)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1611 (fixed in 10.0.25398.1611)
• Microsoft Windows Server 2025: before 10.0.26100.4061 (fixed in 10.0.26100.4061)

Published 2025-05-13. Last modified 2026-06-17.