CVE-2025-21333: Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability
First published: Tue Jan 14 2025(Updated: )
Microsoft Windows Hyper-V NT Kernel Integration VSP contains a heap-based buffer overflow 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 Server 2025 | ||
| Microsoft Windows 11 | =24H2 | |
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows 11 | =23H2 | |
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows 11 | =23H2 | |
| Microsoft Windows 10 | =22H2 | |
| Microsoft Windows 11 | =24H2 | |
| Microsoft Windows 10 | =21H2 | |
| Microsoft Windows Server 2025 | ||
| 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 23h2 | <10.0.22621.4751 | |
| Microsoft Windows 11 23h2 | <10.0.22631.4751 | |
| 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.
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Reference Links
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333 (Advisory)
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21333
- https://nvd.nist.gov/vuln/detail/CVE-2025-21333
- 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-2025-21333?
CVE-2025-21333 is classified as an elevation of privilege vulnerability that allows local attackers to gain SYSTEM privileges.
How do I fix CVE-2025-21333?
To mitigate CVE-2025-21333, apply the latest patches provided by Microsoft for the affected versions of Windows.
Which versions of Windows are affected by CVE-2025-21333?
CVE-2025-21333 affects Microsoft Windows Server 2025, Windows 11 versions 22H2, 23H2, and 24H2, and Windows 10 versions 21H2 and 22H2.
What type of vulnerability is CVE-2025-21333?
CVE-2025-21333 is a heap-based buffer overflow vulnerability in the Microsoft Windows Hyper-V NT Kernel Integration.
Can CVE-2025-21333 be exploited remotely?
No, CVE-2025-21333 requires local access for exploitation, thus posing a risk primarily to local users.
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