CVE-2025-21418

high

Description

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

From the Tenable Blog

Microsoft’s February 2025 Patch Tuesday Addresses 55 CVEs (CVE-2025-21418, CVE-2025-21391)

Published: 2025-02-11

Microsoft addresses 55 CVEs with three rated critical and four zero-day vulnerabilities, including two that were exploited in the wild.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418

https://www.securityweek.com/august-2026-patch-tuesday-microsoft-fixes-421-cves-one-exploited-zero-day/

https://thehackernews.com/2025/02/microsofts-patch-tuesday-fixes-63-flaws.html

https://securityaffairs.com/174135/security/u-s-cisa-adds-microsoft-windows-zyxel-device-flaws-known-exploited-vulnerabilities-catalog.html

https://hackread.com/patch-tuesday-microsoft-fixes-0-day-bugs/

https://www.securityweek.com/microsoft-patches-wormable-windows-flaw-and-file-deleting-zero-day/

https://www.cisa.gov/news-events/alerts/2025/02/11/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://www.tenable.com/blog/microsofts-august-2026-patch-tuesday-addresses-398-cves-cve-2026-68820

https://www.tenable.com/blog/microsofts-may-2025-patch-tuesday-addresses-71-cves-cve-2025-32701-cve-2025-32706

https://www.tenable.com/blog/microsofts-february-2025-patch-tuesday-addresses-55-cves-cve-2025-21418-cve-2025-21391

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21418

https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-2476

Details

Source: Mitre, NVD

Published: 2025-02-11

Updated: 2025-10-27

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.01568

Detections

Analytics