CVE-2026-40407: 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. An authorized attacker with local access can exploit this flaw to gain elevated privileges, potentially compromising system integrity. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, which can lead to full system compromise or unauthorized actions at a higher privilege level. The vulnerability affects confidentiality, integrity, and availability of the system. There are no reports of active exploitation in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. It is recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40407 to remediate this vulnerability. No additional mitigation steps are specified by the vendor.
CVE-2026-40407: 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.
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. An authorized attacker with local access can exploit this flaw to gain elevated privileges, potentially compromising system integrity. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, which can lead to full system compromise or unauthorized actions at a higher privilege level. The vulnerability affects confidentiality, integrity, and availability of the system. There are no reports of active exploitation in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. It is recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40407 to remediate this vulnerability. No additional mitigation steps are specified by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-13T00:27:50.798Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40407","vendor":"Microsoft"}]
Threat ID: 6a036557cbff5d861008c9c1
Added to database: 5/12/2026, 5:37:27 PM
Last enriched: 5/12/2026, 6:23:48 PM
Last updated: 5/13/2026, 4:03:14 AM
Views: 3
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