CVE-2026-40377: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Heap-based buffer overflow in Windows Cryptographic Services allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40377) involves a heap-based buffer overflow in the Windows Cryptographic Services component of Microsoft Windows 10 Version 1607 (build 10.0.14393.0). An attacker with local authorized access can exploit this flaw to elevate their privileges. The vulnerability is classified under CWE-122 (Heap-based Buffer Overflow). Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow a local authorized attacker to elevate their privileges, potentially gaining higher-level access to the affected system. This could lead to full system compromise depending on the privileges gained. The CVSS v3.1 base score is 7.8, indicating a high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40377 to remediate this issue.
CVE-2026-40377: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
Heap-based buffer overflow in Windows Cryptographic Services 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 (CVE-2026-40377) involves a heap-based buffer overflow in the Windows Cryptographic Services component of Microsoft Windows 10 Version 1607 (build 10.0.14393.0). An attacker with local authorized access can exploit this flaw to elevate their privileges. The vulnerability is classified under CWE-122 (Heap-based Buffer Overflow). Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow a local authorized attacker to elevate their privileges, potentially gaining higher-level access to the affected system. This could lead to full system compromise depending on the privileges gained. The CVSS v3.1 base score is 7.8, indicating a high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40377 to remediate this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-11T23:06:15.615Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40377","vendor":"Microsoft"}]
Threat ID: 6a036554cbff5d861008c959
Added to database: 05/12/2026, 17:37:24 UTC
Last enriched: 06/19/2026, 17:37:49 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 50
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