Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability (CVE-2025-32709)
Severity: high · Patch status: unknown · Since 2025-05-13 · CVE-2025-32709
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator. CISA added CVE-2025-32709 to its Known Exploited Vulnerabilities catalog on May 13, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jun 3, 2025 (BOD 22-01); treat that as the outer limit.
Sources
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