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CVE-2025-21418: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

High · CVSS 7.8 (CVSS 3.1)KEV known exploitedEPSS 2.1%, 82th percentilePublished Updated Assigner: microsoft

In CISA’s Known Exploited Vulnerabilities catalog: Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability.

Added , federal remediation due . Known ransomware use: Unknown.

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Description

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C · CWE-122

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Microsoft: Windows 10 Version 1507Microsoft: Windows 10 Version 1607Microsoft: Windows 10 Version 1809Microsoft: Windows 10 Version 21H2Microsoft: Windows 10 Version 22H2Microsoft: Windows 11 version 22H2Microsoft: Windows 11 version 22H3Microsoft: Windows 11 Version 23H2Microsoft: Windows 11 Version 24H2Microsoft: Windows Server 2008 R2 Service Pack 1Microsoft: Windows Server 2008 R2 Service Pack 1 (Server Core installation)Microsoft: Windows Server 2008 Service Pack 2Microsoft: Windows Server 2008 Service Pack 2 (Server Core installation)Microsoft: Windows Server 2012Microsoft: Windows Server 2012 R2Microsoft: Windows Server 2012 R2 (Server Core installation)Microsoft: Windows Server 2012 (Server Core installation)Microsoft: Windows Server 2016Microsoft: Windows Server 2016 (Server Core installation)Microsoft: Windows Server 2019Microsoft: Windows Server 2019 (Server Core installation)Microsoft: Windows Server 2022Microsoft: Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft: Windows Server 2025Microsoft: Windows Server 2025 (Server Core installation)

References

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