CVE-2026-85871: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
CVE-2026-85871 is a heap-based buffer overflow vulnerability in Windows Kernel-Mode Drivers affecting multiple versions of Microsoft Windows 10, including Version 1607. 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 1607
Microsoft
Windows 10 Version 1809
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 11 Version 26H2
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
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 involves a heap-based buffer overflow in Windows Kernel-Mode Drivers, which can be exploited by an authorized local attacker to gain elevated privileges on affected Windows 10 systems. The issue affects multiple specific build ranges of Windows 10 versions, including but not limited to builds starting from 10.0.14393.0 up to but excluding 10.0.14393.9612, and other similar build ranges as enumerated. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges, potentially gaining higher-level access to the affected system. This can lead to full system compromise depending on the privileges gained. The CVSS v3.1 base score is 7.8, indicating high severity with impacts on confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85871 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-04T18:18:19.324Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85871","vendor":"Microsoft"}]
Threat ID: 6ace85482cdf04f6569fec5f
Added to database: 10/13/2026, 19:23:52 UTC
Last enriched: 10/14/2026, 03:03:46 UTC
Last updated: 10/14/2026, 03:03:46 UTC
Views: 2
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