CVE-2026-71337: CWE-121: Stack-based Buffer Overflow in Microsoft Windows 10 Version 21H2
Description
CVE-2026-71337 is a high-severity stack-based buffer overflow vulnerability in the Windows Storage Management Provider component of Microsoft Windows 10 Version 21H2. It allows an authorized local attacker to elevate privileges. The vulnerability affects multiple specific builds of Windows 10 21H2 and related versions. An official fix is available from Microsoft.
CVSS v3.1
7.8high
Affected software
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a stack-based buffer overflow in the Windows Storage Management Provider on Windows 10 Version 21H2 and related builds. It permits an authorized local attacker to elevate privileges by exploiting the overflow condition. The CVSS 3.1 base score is 7.8, indicating high severity, with impact on confidentiality, integrity, and availability. The vulnerability requires local access with low complexity and no user interaction. Microsoft has published an official fix for affected versions.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher system rights. The vulnerability impacts confidentiality, integrity, and availability of the affected system. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for the affected Windows 10 versions as soon as possible to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 08/05/2026
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [object Object]
Threat ID: 6aa04540acd9273b49fa9c37
Added to database: 09/08/2026, 17:26:24 UTC
Last enriched: 10/16/2026, 21:43:10 UTC
Last updated: 10/24/2026, 08:45:12 UTC
Views: 51
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