CVE-2025-21334: Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
First published: Tue Jan 14 2025(Updated: )
Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges.
Credit: secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows 11 | =24H2 | |
| Microsoft Windows 11 | =23H2 | |
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows 11 | =23H2 | |
| Microsoft Windows 11 | =24H2 | |
| Microsoft Windows Server 2025 | ||
| Microsoft Windows Server 2025 | ||
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows | ||
| Microsoft Windows Server 2022 23H2 | ||
| Microsoft Windows 10 21h2 | <10.0.19044.5371 | |
| Microsoft Windows 10 22h2 | <10.0.19045.5371 | |
| Microsoft Windows 11 22h2 | <10.0.22621.4751 | |
| Microsoft Windows 11 22h2 | <10.0.22621.4751 | |
| Microsoft Windows 11 23h2 | <10.0.22631.4751 | |
| Microsoft Windows 11 23h2 | <10.0.22631.4751 | |
| Microsoft Windows 11 Home Edition | <10.0.26100.2894 | |
| Microsoft Windows 11 Home Edition | <10.0.26100.2894 | |
| Microsoft Windows Server 2022 23H2 | <10.0.25398.1369 | |
| Microsoft Windows Server 2025 | <10.0.26100.2894 |
Remedy
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21334 (Advisory)
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21334
- https://nvd.nist.gov/vuln/detail/CVE-2025-21334
- https://www.darkreading.com/application-security/microsoft-january-2025-record-security-update
- https://www.theregister.com/2025/01/15/patch_tuesday_january_2025/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2025-21334?
CVE-2025-21334 has been classified as a critical vulnerability due to its potential for local attackers to gain SYSTEM privileges.
How do I fix CVE-2025-21334?
To fix CVE-2025-21334, it is recommended to apply the latest security updates provided by Microsoft for affected versions of Windows.
Which versions of Windows are affected by CVE-2025-21334?
CVE-2025-21334 affects various versions of Microsoft Windows including Windows 10 and Windows 11 across specific build numbers.
What type of vulnerability is CVE-2025-21334?
CVE-2025-21334 is a use-after-free vulnerability that can lead to elevation of privilege.
Can remote attackers exploit CVE-2025-21334?
No, CVE-2025-21334 requires local access, making it exploitable only by local attackers.
- collector/msrc-cve
- source/Microsoft
- agent/software-canonical-lookup
- agent/type
- collector/msrc
- exploited/true
- collector/cisa-known-exploited
- source/CISA
- agent/author
- agent/first-publish-date
- agent/description
- collector/darkreading
- source/Dark Reading
- alias/CVE-2025-21335
- alias/CVE-2025-21333
- alias/CVE-2025-21334
- alias/CVE-2025-21186
- alias/CVE-2025-21366
- alias/CVE-2025-21395
- alias/CVE-2025-21275
- alias/CVE-2025-21308
- alias/CVE-2025-21311
- alias/CVE-2025-21307
- alias/CVE-2025-21298
- collector/the-register
- source/The Register
- alias/CVE-2025-21362
- alias/CVE-2025-21354
- alias/CVE-2025-21309
- alias/CVE-2025-21297
- alias/CVE-2025-21380
- alias/CVE-2025-21385
- alias/CVE-2025-21178
- agent/references
- agent/trending
- agent/weakness
- agent/remedy
- agent/source
- agent/title
- agent/event
- agent/news-ai
- zeroday/true
- agent/severity
- collector/epss-latest
- source/FIRST
- agent/epss
- agent/last-modified-date
- agent/software-canonical-lookup-request
- agent/tags
- agent/softwarecombine
- collector/nvd-api
- source/NVD
- collector/nvd-cve
- collector/mitre-cve
- source/MITRE
- vendor/microsoft
- canonical/microsoft windows 11
- version/microsoft windows 11/24h2
- version/microsoft windows 11/23h2
- canonical/microsoft windows 10
- version/microsoft windows 10/22h2
- version/microsoft windows 11/22h2
- canonical/microsoft windows server 2025
- version/microsoft windows 10/21h2
- canonical/microsoft windows
- canonical/microsoft windows server 2022 23h2
- canonical/microsoft windows 10 21h2
- canonical/microsoft windows 10 22h2
- canonical/microsoft windows 11 22h2
- canonical/microsoft windows 11 23h2
- canonical/microsoft windows 11 home edition