CVE-2026-68820
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply 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 notes
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-68820 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-68820
Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Severity
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 to <10.0.14393.9418 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 to <10.0.17763.9121 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 to <10.0.19044.7663 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 to <10.0.19045.7663 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 to <10.0.22631.7517 |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 to <10.0.22631.7517 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 to <10.0.26100.9168 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 to <10.0.26200.9168 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 to <10.0.28000.2704 |
| Microsoft | Windows Server 2012 | 6.2.9200.0 to <6.2.9200.26280 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 to <6.2.9200.26280 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 to <6.3.9600.23338 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 to <6.3.9600.23338 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 to <10.0.14393.9418 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 to <10.0.14393.9418 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 to <10.0.17763.9121 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 to <10.0.17763.9121 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 to <10.0.20348.5499 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 to <10.0.26100.33296 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 to <10.0.26100.33296 |
References
1 LinksRecord Details
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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.