CVEvulnerability

CVE-2026-68820

7.0 HIGH Known exploited Published 2026-08-11 Modified 2026-10-26 Official page ↗

CISA Known Exploited Vulnerability

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

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

Added to KEV
2026-08-11
Remediation due
2026-08-25
Ransomware use
Unknown
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.
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
Status
Analyzed
Published
2026-08-11
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-416

Description

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

Affected configurations

• microsoft windows 10 1607 (< 10.0.14393.9418) • microsoft windows 10 1809 (< 10.0.17763.9115) • microsoft windows 10 21h2 (< 10.0.19044.7663) • microsoft windows 10 22h2 (< 10.0.19045.7663) • microsoft windows 11 23h2 (< 10.0.22631.7517) • microsoft windows 11 24h2 (< 10.0.26100.9106) • microsoft windows 11 25h2 (< 10.0.26200.9106) • microsoft windows 11 26h1 (< 10.0.28000.2704) • microsoft windows server 2012 • microsoft windows server 2012 r2 • microsoft windows server 2016 (< 10.0.14393.9418) • microsoft windows server 2019 (< 10.0.17763.9115) • microsoft windows server 2022 (< 10.0.20348.5440) • microsoft windows server 2025 (< 10.0.26100.33222)

Related

Weakness · CWE (1)

References