CVE-2026-20810
Unknown Unknown - Not Provided
Use-After-Free in Windows WinSock Driver Enables Local Privilege Escalation

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description
Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-01-13
Last Modified
2026-01-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20810
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_ancillary_function_driver_for_winsock *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-590 The product calls free() on a pointer to memory that was not allocated using associated heap allocation functions such as malloc(), calloc(), or realloc().
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Executive Summary

This vulnerability is a 'free of memory not on the heap' issue in the Windows Ancillary Function Driver for WinSock. It allows an authorized attacker to locally elevate their privileges on the affected system.

Impact Analysis

An attacker who already has some level of access to the system could exploit this vulnerability to gain higher privileges, potentially allowing them to execute unauthorized actions, access sensitive data, or compromise system integrity.

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