May 13, 2025 · Applied Cybernetics Group
CVE-2025-32709 — Microsoft Windows
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
- Added to KEV
2025-05-13- Federal due date
2025-06-03- Vendor
- Microsoft
- Product
- Windows
- EPSS
- 81.1th percentile (score 0.021, as of
2026-09-16) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1003 , T1059 , T1068 , T1543 , T1608.001 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2025-32709
CISA short description
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.