Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability (CVE-2025-21334)
Severity: high · Patch status: patched · Since 2025-01-14 · CVE-2025-21334
Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges. CISA added CVE-2025-21334 to its Known Exploited Vulnerabilities catalog on Jan 14, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Feb 4, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch