CVE-2026-20840: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability is a heap-based buffer overflow in the Windows NTFS driver on Windows 10 Version 1607 (build 10.0.14393.0). An authorized attacker with local access can exploit this flaw to execute arbitrary code on the affected system. The vulnerability is tracked as CWE-122 and has a CVSS v3.1 base score of 7.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows local attackers with authorized access to execute arbitrary code, potentially leading to full system compromise including complete control over confidentiality, integrity, and availability of the affected system. This could result in unauthorized actions or system instability.
Mitigation Recommendations
An official fix is available from Microsoft. It is strongly recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20840 to remediate this vulnerability.
CVE-2026-20840: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a heap-based buffer overflow in the Windows NTFS driver on Windows 10 Version 1607 (build 10.0.14393.0). An authorized attacker with local access can exploit this flaw to execute arbitrary code on the affected system. The vulnerability is tracked as CWE-122 and has a CVSS v3.1 base score of 7.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows local attackers with authorized access to execute arbitrary code, potentially leading to full system compromise including complete control over confidentiality, integrity, and availability of the affected system. This could result in unauthorized actions or system instability.
Mitigation Recommendations
An official fix is available from Microsoft. It is strongly recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20840 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.376Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20840","vendor":"Microsoft"}]
Threat ID: 69668adea60475309f9ae09a
Added to database: 01/13/2026, 18:11:42 UTC
Last enriched: 07/30/2026, 23:46:35 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 167
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