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CVE-2026-68820

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

High7.0Known exploitedPublic exploitEPSS 8.6%
Published
Updated
Reserved
Assigned by
microsoft

Description

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

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability.

Added
11 Aug 2026
Fix due (US federal)
25 Aug 2026
Used by ransomware
Not known

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.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.

Timeline

  1. ID reserved

    By microsoft

  2. · 11 days later

    Published

  3. Added to CISA KEV

    Known exploited in the wild

  4. · 3 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-68820, by who scored it
Scored byCVSSScoreVector
microsoftCNA (assigner)3.1High7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
NVDNVD · Analyzed3.1High7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
8.6% · top 4.9% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.

Weakness

Affected products

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .