CVE-2025-21333: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 21H2
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
AI Analysis
Technical Summary
This vulnerability (CVE-2025-21333) is a heap-based buffer overflow in the Windows Hyper-V NT Kernel Integration VSP on Windows 10 Version 21H2 (build 10.0.19044.0). It enables elevation of privilege by exploiting improper memory handling in the kernel integration component. The CVSS 3.1 vector indicates it requires local access with low complexity and no user interaction, and it impacts confidentiality, integrity, and availability with high severity. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with limited privileges on the system to gain elevated privileges, potentially leading to full control over the affected Windows 10 system. The impact includes complete compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 21H2 (build 10.0.19044.0) as soon as possible to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333 for update details.
CVE-2025-21333: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 21H2
Description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2025-21333) is a heap-based buffer overflow in the Windows Hyper-V NT Kernel Integration VSP on Windows 10 Version 21H2 (build 10.0.19044.0). It enables elevation of privilege by exploiting improper memory handling in the kernel integration component. The CVSS 3.1 vector indicates it requires local access with low complexity and no user interaction, and it impacts confidentiality, integrity, and availability with high severity. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with limited privileges on the system to gain elevated privileges, potentially leading to full control over the affected Windows 10 system. The impact includes complete compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 21H2 (build 10.0.19044.0) as soon as possible to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333 for update details.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2024-12-11T00:29:48.351Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333","vendor":"Microsoft"}]
Threat ID: 68881726ad5a09ad0088bbc0
Added to database: 07/29/2025, 00:34:46 UTC
Last enriched: 06/10/2026, 09:55:45 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 251
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