Actively exploited · Published Jan 14, 2025 · Assigned by microsoft
CVE-2025-21333Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
High 7.8 Exploited
In plain English
A high-severity heap buffer overflow in Windows 10 Version 21H2 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on January 14, 2025). The chance it is exploited in the next 30 days is estimated at 10.1% (higher than 96% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Feb 4, 2025.
Official description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 – before 10.0.19044.5371 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – before 10.0.19045.5371 |
| Microsoft | Windows 11 version 22H2 | 10.0.22621.0 – before 10.0.22621.4751 |
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0 – before 10.0.22631.4751 |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 – before 10.0.22631.4751 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – before 10.0.26100.2894 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 – before 10.0.25398.1369 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – before 10.0.26100.2894 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – before 10.0.26100.2894 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability vendor-advisory, patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333 government-resource
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script
- https://www.exploit-db.com/exploits/52436