CVE-2025-21333
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability.
- Added
- 14 Jan 2025
- Fix due (US federal)
- 4 Feb 2025
- Used by ransomware
- Not known
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | High7.8 | 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 |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 10.1% · top 4.3% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
Microsoft · Windows 10 Version 21H2
- affected 10.0.19044.0 – < 10.0.19044.5371
Microsoft · Windows 10 Version 22H2
- affected 10.0.19045.0 – < 10.0.19045.5371
Microsoft · Windows 11 version 22H2
- affected 10.0.22621.0 – < 10.0.22621.4751
Microsoft · Windows 11 version 22H3
- affected 10.0.22631.0 – < 10.0.22631.4751
Microsoft · Windows 11 Version 23H2
- affected 10.0.22631.0 – < 10.0.22631.4751
Microsoft · Windows 11 Version 24H2
- affected 10.0.26100.0 – < 10.0.26100.2894
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)
- affected 10.0.25398.0 – < 10.0.25398.1369
Microsoft · Windows Server 2025
- affected 10.0.26100.0 – < 10.0.26100.2894
Microsoft · Windows Server 2025 (Server Core installation)
- affected 10.0.26100.0 – < 10.0.26100.2894
References (5)
- Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability (opens in a new tab)vendor-advisorypatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21333 (opens in a new tab)government-resource
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script (opens in a new tab)
- https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script (opens in a new tab)
- https://www.exploit-db.com/exploits/52436 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-21333)Record last updated .