Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – < 10.0.14393.9418 | 10.0.14393.9418 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – < 10.0.17763.9121 | 10.0.17763.9121 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 – < 10.0.19044.7663 | 10.0.19044.7663 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – < 10.0.19045.7663 | 10.0.19045.7663 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 – < 10.0.22631.7517 | 10.0.22631.7517 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.9168 | 10.0.26100.9168 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.9168 | 10.0.26200.9168 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.2704 | 10.0.28000.2704 |
| Microsoft | Windows Server 2012 | 6.2.9200.0 – < 6.2.9200.26280 | 6.2.9200.26280 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 – < 6.2.9200.26280 | 6.2.9200.26280 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – < 6.3.9600.23338 | 6.3.9600.23338 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 – < 6.3.9600.23338 | 6.3.9600.23338 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – < 10.0.14393.9418 | 10.0.14393.9418 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – < 10.0.14393.9418 | 10.0.14393.9418 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – < 10.0.17763.9121 | 10.0.17763.9121 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – < 10.0.17763.9121 | 10.0.17763.9121 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.5499 | 10.0.20348.5499 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.33296 | 10.0.26100.33296 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.33296 | 10.0.26100.33296 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 4 repositories
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fevar54/CVE-2026-68820-Mitigation-PoC- ★ 1 · Aug 24, 2026
Demostracion educativa de mitigacion de CVE-2026-68820: Use-After-Free en afd.sys de Windows.
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ubitquity/Windows-WinSock-UAF-Mitigation ★ 1 · Aug 15, 2026
This repository contains a conceptual patch demonstrating the mitigation for CVE-2026-68820, a critical Use-After-Free (UAF) vulnerability in the Windows Ancillary Function Driver for WinSock (`afd.s…
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maxprog-svg/CVE-2026-68820_Mass_Exploit ★ 0 · Aug 25, 2026
CVE-2026-68820 — Mass Exploit Framework Edition.
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HORKimhab/CVE-2026-68820 ★ 0 · Aug 13, 2026
CVE-2026-68820 - Draft or TODO
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- WID-SEC-2026-2756 Microsoft Windows Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026
- NCSC-2026-0284 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Aug 11, 2026
- MSRC-CVE-2026-68820 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability Microsoft Security Response Center · Aug 11, 2026
References
- Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability vendor-advisory patch