# CVE-2026-68820: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

> CVE-2026-68820: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability. CVSS 7.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-68820
Last updated: 2026-10-21T20:52:47Z

- Published: 2026-08-11 17:05 UTC · Updated: 2026-10-21 20:52 UTC · Assigner: microsoft
- CVSS: 7.0 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- EPSS: 0.33%, 26th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-08-11, federal due date 2026-08-25, ransomware use: Unknown
- CWE: CWE-416

## Description

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

## CISA 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.

## Affected vendors and products

- Microsoft: Windows 10 Version 1607
- Microsoft: Windows 10 Version 1809
- Microsoft: Windows 10 Version 21H2
- Microsoft: Windows 10 Version 22H2
- Microsoft: Windows 11 version 23H2
- Microsoft: Windows 11 Version 23H2
- Microsoft: Windows 11 Version 24H2
- Microsoft: Windows 11 Version 25H2
- Microsoft: Windows 11 version 26H1
- Microsoft: Windows Server 2012
- Microsoft: Windows Server 2012 R2
- Microsoft: Windows Server 2012 R2 (Server Core installation)
- Microsoft: Windows Server 2012 (Server Core installation)
- Microsoft: Windows Server 2016
- Microsoft: Windows Server 2016 (Server Core installation)
- Microsoft: Windows Server 2019
- Microsoft: Windows Server 2019 (Server Core installation)
- Microsoft: Windows Server 2022
- Microsoft: Windows Server 2025
- Microsoft: Windows Server 2025 (Server Core installation)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-68820)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-68820)
- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68820](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68820)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-68820 · Markdown: https://rewindex.com/cve/CVE-2026-68820.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-68820 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:06.235Z