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CVE-2026-68820

HighPublished

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published: Aug 11, 2026
Updated: Sep 16, 2026
Assigning CNA: microsoft
Evidence observed: Aug 11, 2026

Primary CVSS

7.0/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

6.2%

Low · next 30 days

Percentile: 93.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Sources

CVE-2026-68820-Mitigation-PoC-Research
Demostracion educativa de mitigacion de CVE-2026-68820: Use-After-Free en afd.sys de Windows.
CVE-2026-68820_Mass_ExploitExploit
Automated local privilege escalation exploit for Windows 10/11 targeting AFD.sys use-after-free to gain SYSTEM, with PPL bypass and EDR evasion for post-exploitation.
Windows-WinSock-UAF-MitigationPatch
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.sys`).

Responsible use

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