Exploited vulnerability CISA KEV
CVE-2026-68820: Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
CVE-2026-68820 is a vulnerability in Microsoft Windows Ancillary Function Driver for WinSock that CISA added to its Known Exploited Vulnerabilities catalog on August 11, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by August 25, 2026.
CVE-2026-68820 is a vulnerability in Microsoft Windows Ancillary Function Driver for WinSock that CISA added to its Known Exploited Vulnerabilities catalog on August 11, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by August 25, 2026.
- CVE ID
- CVE-2026-68820
- Vendor / project
- Microsoft
- Product
- Windows Ancillary Function Driver for WinSock
- Added to KEV
- Due date
- Days to remediate
- 14
- Known ransomware use
- Unknown
- Weakness
- CWE-416
CISA description #
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.
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 and references #
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
This page reproduces CISA’s catalog entry and is not indexed by search engines until an editor adds analysis. [Editorial analysis pending]