CVE-2025-21333

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

CVE-2025-21333 is fixed in 11 products on 1 platform, first by KB5049981, released January 14, 2025. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on January 14, 2025. Patch Radar priority: Patch now.

Patch nowCISA KEV

CVSS

7.8

Important

Exploitation

Exploited

Reported by the vendor

CISA KEV

Jan 14, 2025

Federal due date Feb 4, 2025

EPSS

0.1007

95th percentile

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 10 Version 21H2 for x64-based Systems		KB5049981	Jan 14, 2025
Windows 10 Version 22H2 for x64-based Systems		KB5049981	Jan 14, 2025
Windows 11 Version 22H2 for ARM64-based Systems		KB5050021	Jan 14, 2025
Windows 11 Version 22H2 for x64-based Systems		KB5050021	Jan 14, 2025
Windows 11 Version 23H2 for ARM64-based Systems		KB5050021	Jan 14, 2025
Windows 11 Version 23H2 for x64-based Systems		KB5050021	Jan 14, 2025
Windows 11 Version 24H2 for ARM64-based Systems	26100.2894	KB5050009	Jan 14, 2025
Windows 11 Version 24H2 for x64-based Systems	26100.2894	KB5050009	Jan 14, 2025
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.1369	KB5049984	Jan 14, 2025
Windows Server 2025	26100.2894	KB5050009	Jan 14, 2025
Windows Server 2025 (Server Core installation)	26100.2894	KB5050009	Jan 14, 2025

Details

Published
January 14, 2025
Weakness
Heap-based Buffer Overflow
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333

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