CVE-2026-69480: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 21H2
Description
CVE-2026-69480 is a heap-based buffer overflow vulnerability in the Windows Partition Management Driver affecting Windows 10 Version 21H2 and related builds. This flaw allows an authorized local attacker to elevate privileges. The vulnerability has a high severity score of 7.8 and has been officially fixed by Microsoft.
CVSS v3.1
Score 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)
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based buffer overflow in the Windows Partition Management Driver on Windows 10 Version 21H2 and several related builds. An authorized local attacker can exploit this flaw to elevate privileges on the affected system. The CVSS v3.1 base score is 7.8, indicating high severity, with impacts to confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability, and no known exploits are currently reported in the wild.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher system rights. The vulnerability affects confidentiality, integrity, and availability of the system as indicated by the CVSS vector. There are no reports of active exploitation 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 Windows 10 Version 21H2 and the affected builds as soon as possible to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:07:24.908Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69480","vendor":"Microsoft"}]
Threat ID: 6aa04500acd9273b49fa810b
Added to database: 09/08/2026, 17:25:20 UTC
Last enriched: 10/16/2026, 21:15:51 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 23
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