HIGHCVE-2026-21247Published Modified CNA microsoft
CVE-2026-21247: Windows Hyper-V Remote Code Execution Vulnerability
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
Metrics
- CVSS v3.1
- 7.3
- Severity
- HIGH
- Fixed in
- 10.0.14393.8868
- Affected Products
- 18
Fix available
10.0.14393.886810.0.17763.838910.0.19044.693710.0.19045.693710.0.20348.477310.0.22631.664910.0.25398.214910.0.26100.784010.0.26100.3237010.0.26200.784010.0.28000.1575
Patch commits
Affected packages
- Microsoft / Windows 10 Version 1607< 10.0.14393.8868 (from 10.0.14393.0)
- Microsoft / Windows 10 Version 1809< 10.0.17763.8389 (from 10.0.17763.0)
- Microsoft / Windows 10 Version 21H2< 10.0.19044.6937 (from 10.0.19044.0)
- Microsoft / Windows 10 Version 22H2< 10.0.19045.6937 (from 10.0.19045.0)
- Microsoft / Windows 11 version 22H3< 10.0.22631.6649 (from 10.0.22631.0)
- Microsoft / Windows 11 Version 23H2< 10.0.22631.6649 (from 10.0.22631.0)
- Microsoft / Windows 11 Version 24H2< 10.0.26100.7840 (from 10.0.26100.0)
- Microsoft / Windows 11 Version 25H2< 10.0.26200.7840 (from 10.0.26200.0)
- Microsoft / Windows 11 version 26H1< 10.0.28000.1575 (from 10.0.28000.0)
- Microsoft / Windows 11 Version 26H1< 10.0.28000.1575 (from 10.0.28000.0)
- Microsoft / Windows Server 2016< 10.0.14393.8868 (from 10.0.14393.0)
- Microsoft / Windows Server 2016 (Server Core installation)< 10.0.14393.8868 (from 10.0.14393.0)
- Microsoft / Windows Server 2019< 10.0.17763.8389 (from 10.0.17763.0)
- Microsoft / Windows Server 2019 (Server Core installation)< 10.0.17763.8389 (from 10.0.17763.0)
- Microsoft / Windows Server 2022< 10.0.20348.4773 (from 10.0.20348.0)
- Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)< 10.0.25398.2149 (from 10.0.25398.0)
- Microsoft / Windows Server 2025< 10.0.26100.32370 (from 10.0.26100.0)
- Microsoft / Windows Server 2025 (Server Core installation)< 10.0.26100.32370 (from 10.0.26100.0)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C