CVE DATABASE / CVE-2025-21334
CVE-2025-21334
Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
CVSS 7.8 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2025-01-14.
Federal remediation due 2025-02-04.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Summary
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
CVSS 3.1 breakdown
| Base score | 7.8 (HIGH) |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Microsoft windows 10 21h2Microsoft windows 10 22h2Microsoft windows 11 22h2Microsoft windows 11 23h2Microsoft windows 11 24h2Microsoft windows server 2022 23h2Microsoft windows server 2025
Check this CVE live
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References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21334
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21334
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-27. Always verify against the vendor advisory before acting.