CVE-2026-45638: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability involves a use-after-free condition in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation by an authorized local attacker can lead to privilege escalation. The issue is classified as CWE-122 (Heap-based Buffer Overflow). Microsoft has published an official fix to address this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate their privileges, potentially gaining higher system rights. The vulnerability affects confidentiality, integrity, and availability, all rated high impact according to the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the provided security update as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45638 to remediate this vulnerability.
CVE-2026-45638: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a use-after-free condition in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation by an authorized local attacker can lead to privilege escalation. The issue is classified as CWE-122 (Heap-based Buffer Overflow). Microsoft has published an official fix to address this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate their privileges, potentially gaining higher system rights. The vulnerability affects confidentiality, integrity, and availability, all rated high impact according to the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the provided security update as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45638 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T20:33:35.156Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45638","vendor":"Microsoft"}]
Threat ID: 6a284ce78dd33fbd85664ec9
Added to database: 6/9/2026, 5:27:03 PM
Last enriched: 6/9/2026, 6:41:35 PM
Last updated: 6/10/2026, 5:01:57 AM
Views: 2
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