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CVE-2026-68820

Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability

Microsoft Windows Ancillary Function Driver for WinSock Operating systems
Open in ThreatlineRecord JSON
CVSS
7.0High
ExploitationExploited in the wildAdded to KEV 11 Aug 2026CISA KEV
Exploit odds (EPSS)0.33%Chance of exploitation activity in the next 30 days, higher than 25% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.14393.9418Also 10.0.17763.9121, 10.0.19044.7663 and 9 moreCVE List
Federal deadline25 Aug 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. CISA KEV

What fixes it

  • 10.0.14393.9418Windows 10 Version 1607CVE List
  • 10.0.17763.9121Windows 10 Version 1809CVE List
  • 10.0.19044.7663Windows 10 Version 21H2CVE List
  • 10.0.19045.7663Windows 10 Version 22H2CVE List
  • 10.0.22631.7517Windows 11 version 23H2CVE List
  • 10.0.22631.7517Windows 11 Version 23H2CVE List
Show all 20 fixed versions
  • 10.0.26100.9168Windows 11 Version 24H2CVE List
  • 10.0.26200.9168Windows 11 Version 25H2CVE List
  • 10.0.28000.2704Windows 11 version 26H1CVE List
  • 6.2.9200.26280Windows Server 2012CVE List
  • 6.2.9200.26280Windows Server 2012 (Server Core installation)CVE List
  • 6.3.9600.23338Windows Server 2012 R2CVE List
  • 6.3.9600.23338Windows Server 2012 R2 (Server Core installation)CVE List
  • 10.0.14393.9418Windows Server 2016CVE List
  • 10.0.14393.9418Windows Server 2016 (Server Core installation)CVE List
  • 10.0.17763.9121Windows Server 2019CVE List
  • 10.0.17763.9121Windows Server 2019 (Server Core installation)CVE List
  • 10.0.20348.5499Windows Server 2022CVE List
  • 10.0.26100.33296Windows Server 2025CVE List
  • 10.0.26100.33296Windows Server 2025 (Server Core installation)CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 11 Aug 2026Added to CISA KEVCISA KEV
  2. 11 Aug 2026, 17:05 UTCPublishedCVE List

Description

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.

Text from CVE List

Affected versions 20

  • Windows 10 Version 1607affected: 10.0.14393.0 before 10.0.14393.9418CVE List
  • Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.9121CVE List
  • Windows 10 Version 21H2affected: 10.0.19044.0 before 10.0.19044.7663CVE List
  • Windows 10 Version 22H2affected: 10.0.19045.0 before 10.0.19045.7663CVE List
  • Windows 11 version 23H2affected: 10.0.22631.0 before 10.0.22631.7517CVE List
  • Windows 11 Version 23H2affected: 10.0.22631.0 before 10.0.22631.7517CVE List
  • Windows 11 Version 24H2affected: 10.0.26100.0 before 10.0.26100.9168CVE List
  • Windows 11 Version 25H2affected: 10.0.26200.0 before 10.0.26200.9168CVE List
  • Windows 11 version 26H1affected: 10.0.28000.0 before 10.0.28000.2704CVE List
  • Windows Server 2012affected: 6.2.9200.0 before 6.2.9200.26280CVE List
  • Windows Server 2012 (Server Core installation)affected: 6.2.9200.0 before 6.2.9200.26280CVE List
  • Windows Server 2012 R2affected: 6.3.9600.0 before 6.3.9600.23338CVE List
  • Windows Server 2012 R2 (Server Core installation)affected: 6.3.9600.0 before 6.3.9600.23338CVE List
  • Windows Server 2016affected: 10.0.14393.0 before 10.0.14393.9418CVE List
  • Windows Server 2016 (Server Core installation)affected: 10.0.14393.0 before 10.0.14393.9418CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.9121CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.9121CVE List
  • Windows Server 2022affected: 10.0.20348.0 before 10.0.20348.5499CVE List
  • Windows Server 2025affected: 10.0.26100.0 before 10.0.26100.33296CVE List
  • Windows Server 2025 (Server Core installation)affected: 10.0.26100.0 before 10.0.26100.33296CVE List

References 4