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CVE-2026-45598: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

highCVSS 7CVE-2026-45598
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Ancillary Function Driver for WinSockPrivilege escalation
What
This vulnerability allows an authorized attacker to elevate privileges locally.
Who is affected
Users of Windows Ancillary Function Driver for WinSock are affected.
Urgency
Remediation is urgent due to the high severity of the vulnerability.
Action
Apply the latest security updates from Microsoft.

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45598

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-2026-45598coverage & exploitation statusNVD · CVE.org

Recent advisories for Windows Ancillary Function

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.

More from Microsoft Security Response Center