CVE-2026-20820: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability involves a heap-based buffer overflow in the Windows Common Log File System Driver on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation requires local authorized access and can result in privilege escalation. Microsoft has published an official fix to remediate the issue. No known exploits in the wild have been reported at this time.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate their privileges, potentially gaining higher-level access to the affected system. The vulnerability impacts confidentiality, integrity, and availability with high severity as indicated by the CVSS vector (C:H/I:H/A:H).
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20820 to remediate this vulnerability.
CVE-2026-20820: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based buffer overflow in the Windows Common Log File System Driver on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation requires local authorized access and can result in privilege escalation. Microsoft has published an official fix to remediate the issue. No known exploits in the wild have been reported at this time.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate their privileges, potentially gaining higher-level access to the affected system. The vulnerability impacts confidentiality, integrity, and availability with high severity as indicated by the CVSS vector (C:H/I:H/A:H).
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20820 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.373Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20820","vendor":"Microsoft"}]
Threat ID: 69668adba60475309f9adf9a
Added to database: 01/13/2026, 18:11:39 UTC
Last enriched: 07/30/2026, 23:49:18 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 230
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