CVE-2025-21333
HighExploitedPublic exploitWindows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Published Jan 13, 2025 · Updated Jun 9, 2026
Key Facts
Patch immediately- CVE-2025-21333 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 21h2 (Microsoft), Windows 10 22h2 (Microsoft), Windows 11 22h2 (Microsoft) and 12 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2025. Public exploit code is available.
- EPSS estimates a 10.0% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 21h2 10.0.19044.5371, Windows 10 22h2 10.0.19045.5371, Windows 11 22h2 10.0.22621.4751.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
10.0%
Higher than 95.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-21333 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jan 14, 2025 | Feb 4, 2025 | Not reported |
| Industry KEV feed | Jan 14, 2025 | Feb 4, 2025 | Not reported |
| CIRCL KEV | Jan 14, 2025 | Feb 4, 2025 | Not reported |
| ENISA EUVD | Jan 14, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
16 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 21h2Microsoft | See advisory | 10.0.19044.5371 |
| Windows 10 22h2Microsoft | See advisory | 10.0.19045.5371 |
| Windows 11 22h2Microsoft | See advisory | 10.0.22621.4751 |
| Windows 11 23h2Microsoft | See advisory | 10.0.22631.4751 |
| Windows 11 24h2Microsoft | See advisory | 10.0.26100.2894 |
Patched Releases
Windows 10 21h2
10.0.19044.5371
Windows 10 22h2
10.0.19045.5371
Windows 11 22h2
10.0.22621.4751
Windows 11 23h2
10.0.22631.4751
Windows 11 24h2
10.0.26100.2894
Windows Server 2022 23h2
10.0.25398.1369
Windows Server 2025
10.0.26100.2894
Windows 10 Version 21H2
10.0.19044.5371
Windows 10 Version 22H2
10.0.19045.5371
Windows 11 version 22H2
10.0.22621.4751
Windows 11 version 22H3
10.0.22631.4751
Windows 11 Version 23H2
10.0.22631.4751
Windows 11 Version 24H2
10.0.26100.2894
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.1369
Windows Server 2025 (Server Core installation)
10.0.26100.2894
Timeline
Publicly disclosed
Jan 13, 2025
Added to CISA KEV
Jan 14, 2025
Added to Industry KEV feed
Jan 14, 2025
Added to CIRCL KEV
Jan 14, 2025
Added to ENISA EUVD
Jan 14, 2025
Last updated
Jun 9, 2026
Weakness Type
- CWE-122 Heap-based Buffer Overflow
References
- advisoryhttps://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script
- advisoryhttps://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script
- patchWindows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Affected: Windows 10 21h2 (Microsoft); Windows 10 22h2 (Microsoft); Windows 11 22h2 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2025.
Yes. It was added on Jan 14, 2025 with a federal remediation due date of Feb 4, 2025.
Public exploit code is available.
Fixed versions are available, including Windows 10 21h2 10.0.19044.5371, Windows 10 22h2 10.0.19045.5371, Windows 11 22h2 10.0.22621.4751.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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