SARA / Free Tools / KEV / CVE-2025-21334

CVE-2025-21334 on CISA KEV

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

CISA KEV — Actively Exploited

Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability

Vendor / Product
— / Microsoft / Windows
Added to KEV
2025-01-14
BOD 22-01 due
2025-02-04
Ransomware use
Unknown
CVSS / EPSS
7.8 HIGH · EPSS 6.64%

01What CISA says about this vulnerability

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

02Required action — verbatim from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

03Notes & references

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

VendorProductVersions
MicrosoftWindows 10 Version 21H210.0.19044.0
MicrosoftWindows 10 Version 22H210.0.19045.0
MicrosoftWindows 11 version 22H210.0.22621.0
MicrosoftWindows 11 version 22H310.0.22631.0
MicrosoftWindows 11 Version 23H210.0.22631.0
MicrosoftWindows 11 Version 24H210.0.26100.0
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0
MicrosoftWindows Server 202510.0.26100.0
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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