January 14, 2025 · Applied Cybernetics Group
CVE-2025-21335 — Microsoft Windows
Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
- Added to KEV
2025-01-14- Federal due date
2025-02-04- Vendor
- Microsoft
- Product
- Windows
- EPSS
- 71.4th percentile (score 0.014, as of
2026-10-04) - NVD CVSS v3.1
- 7.8 (HIGH)
- Ransomware use
- Unknown
- ATT&CK
- T1003 , T1068 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2025-21335
CISA short description
Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
NVD description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability