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CVE-2025-21333

7.8
HIGHCVSS v3.1 Base Score
79.69%
HIGH RiskEPSS (99th percentile)
KEV

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

Published: 1/14/2025
Modified: 11/3/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability

Vendor / Product:

Microsoft Windows

Required Action:

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

Due Date: 2/4/2025(OVERDUE)
Added to KEV:

1/14/2025

Notes:

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21333 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21333

Vulnerability Summary

CVSS v3 Score

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score (Exploitation Probability)

79.69%HIGH Exploitation Risk
99th percentile

This vulnerability has a 79.69% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.

CWE Classification

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