What is CVE-2025-21418?

CVE-2025-21418 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2025-21418 cover?

CVE-2025-21418 covers the following CVE IDs: CVE-2025-21418. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-21418?

CVE-2025-21418 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

CVE-2025-21418HighCVSS 7.8

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 3, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2025-21418 →