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CVE-2025-32709: Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability

criticalknown exploitedpublic exploitCVE-2025-32709
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.

CSIRTS triage

vendor: Microsoftproduct: Windows Ancillary Function Driver for WinSockPrivilege escalation
What
This vulnerability allows an authorized attacker to escalate privileges to administrator.
Who is affected
Authorized users of Microsoft Windows with the Ancillary Function Driver for WinSock are affected.
Urgency
Remediation is critical as the vulnerability is actively exploited.
Action
Users should apply the latest updates for the Ancillary Function Driver.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-05-13
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-32709

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-32709coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows Ancillary

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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