CVE-2025-21335
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- High 7.8
- Exploited: added to CISA KEV 14 Jan 2025
Description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Key facts
- Published
- 14 Jan 2025
- Last changed
- 9 Jun 2026
- Assigned by
- microsoft
- KEV added
- 14 Jan 2025
- KEV fix due
- 4 Feb 2025
- EPSS
- 1.401% likely to be exploited in the next 30 days, higher than 72.956% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 7.8CVSS 3.1, Highfrom the CNA (microsoft)
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
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 21H2 |
|
| Microsoft | Windows 10 Version 22H2 |
|
| Microsoft | Windows 11 version 22H2 |
|
| Microsoft | Windows 11 version 22H3 |
|
| Microsoft | Windows 11 Version 23H2 |
|
| Microsoft | Windows 11 Version 24H2 |
|
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) |
|
| Microsoft | Windows Server 2025 |
|
| Microsoft | Windows Server 2025 (Server Core installation) |
|
Timeline
- 14 Jan 2025 CVE-2025-21335 added to CISA KEV
- 14 Jan 2025 Added to the CISA KEV catalogue
- 14 Jan 2025 Published