September 27, 2026
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CVE-2025-21418

High7.8Published on February 11, 2025

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Actively exploited

  • In the CISA exploited-vulnerabilities catalogue since Feb 11, 2025
  • US federal agencies must remediate it by Mar 4, 2025 (BOD 22-01)
  • Attacked 1 day before the vulnerability was made public

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

Source: CISA KEV · Jan 20, 2026 Feb 11, 2025 Feb 11, 2025 Feb 11, 2025 Feb 11, 2025

CVSS score7.8 / 10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)CWE-122
Vendorsmicrosoft

Affected products

VendorsProductVersions
microsoftwindows 10 1607< 10.0.10240.20915
microsoftwindows 10 1809< 10.0.17763.6893
microsoftwindows 10 21h2< 10.0.19044.5487
microsoftwindows 10 22h2< 10.0.19045.5487
microsoftwindows 11 22h2< 10.0.22621.4890
microsoftwindows 11 23h2< 10.0.22631.4890
microsoftwindows 11 24h2< 10.0.26100.3107
microsoftwindows server 2008-
microsoftwindows server 2012-
microsoftwindows server 2016< 10.0.14393.7785
microsoftwindows server 2019< 10.0.17763.6893
microsoftwindows server 2022< 10.0.20348.3148
microsoftwindows server 2022 23h2< 10.0.25398.1425
microsoftwindows server 2025< 10.0.26100.3107

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