CVE-2026-45598

highCVSS 7covered by 1 sourcefirst seen 2026-06-09

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CSIRTS triage

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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Low exploitation risk0.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.

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