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 involves a heap-based buffer overflow in the Windows Cryptographic Services component of Windows 10 Version 1607. An attacker with local authorized access can exploit this flaw to elevate their privileges, potentially gaining higher system rights. Microsoft has published an official fix addressing this issue.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges, potentially gaining higher-level access on the affected system. This could lead to full system compromise depending on the privileges obtained.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40377 for detailed patching instructions.
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
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 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 2022, 23H2 Edition (Server Core installation)
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 the Windows Cryptographic Services component of Windows 10 Version 1607. An attacker with local authorized access can exploit this flaw to elevate their privileges, potentially gaining higher system rights. Microsoft has published an official fix addressing this issue.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges, potentially gaining higher-level access on the affected system. This could lead to full system compromise depending on the privileges obtained.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40377 for detailed patching instructions.
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: 08/11/2026, 16:46:08 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 66
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