EUVD-2026-29623
GHSA-cc8v-q6gq-pf87
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Ancillary Function Driver for WinSock (AFD.sys) allows low-privileged authenticated users to execute arbitrary code with SYSTEM privileges via use-after-free memory corruption. Microsoft has released patches addressing Windows 10 (versions 1607 through 22H2), Windows 11 (versions 22H3 through 26H1), and Windows Server 2012. …
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RemediationAI
Within 24 hours: inventory all Windows 10, Windows 11, and Windows Server 2012 systems in your environment and verify current patch levels using WSUS or third-party patch management tools. Within 7 days: deploy Microsoft security updates for AFD.sys across all affected Windows versions (Windows 10 versions 1607-22H2, Windows 11 versions 22H3-26H1, Windows Server 2012) using your standard change management process, prioritizing systems with high-privileged user access or remote desktop exposure. …
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External POC / Exploit Code
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