CVE-2026-68820

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

Browse: All 2026 CVEs · All vendors

CVSS score: 7.0 High
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA KEV: Yes — actively exploited (added 2026-08-11, remediation due 2026-08-25)
Weakness (CWE): CWE-416
Published: 2026-08-11
Last modified: 2026-08-16
NVD status: Analyzed

Description

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

Affected products

microsoft windows 10 1607
microsoft windows 10 1809
microsoft windows 10 21h2
microsoft windows 10 22h2
microsoft windows 11 23h2
microsoft windows 11 24h2
microsoft windows 11 25h2
microsoft windows 11 26h1
microsoft windows server 2012
microsoft windows server 2016
microsoft windows server 2019
microsoft windows server 2022

Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.

Required action (CISA)

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. Federal remediation deadline: 2026-08-25.

How to prioritize this

This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score.

References

FAQ

Is CVE-2026-68820 actively exploited?

Yes. CISA added CVE-2026-68820 to its Known Exploited Vulnerabilities (KEV) catalog on 2026-08-11, with a federal remediation deadline of 2026-08-25. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.

What is the CVSS score of CVE-2026-68820?

CVE-2026-68820 has a CVSS base score of 7.0 (High). Its vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Related vulnerabilities

Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.