CVE-2025-21418

unknown KEV

Published 2025-02-11 · Modified 2025-02-11

CVSS v3

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CVSS v2

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VIR risk

1.5

Description

Microsoft Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow vulnerability that allows for privilege escalation, enabling a local attacker to gain SYSTEM privileges.

CISA KEV

Vendor: Microsoft
Product: Windows
Due date: 2025-03-04

Predictions

Exploit likelihood

99%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cisa-kev — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21418

Exploits

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21418

Verify integrity in audit chain (admin only). AS-IS.