CVE-2025-32709
Published: May 13, 2025
Official Description
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.
CISA KEV Advisory
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Risk Analysis
This use-after-free vulnerability in Microsoft Windows Ancillary Function Driver for WinSock allows an authorized attacker to escalate privileges to administrator level. This means an attacker who already has some access can gain full control of the system. Its inclusion in CISA's KEV catalog confirms active exploitation, making this a critical privilege escalation.
Active exploitation of this vulnerability has been observed in the wild. This is a local exploitation scenario, requiring an authorized attacker to have initial access to the system.
System administrators should apply the latest security updates for Microsoft Windows. Implement the principle of least privilege for all users to limit potential impact.
Technical Analysis
CVE-2025-32709 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2025-32709 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-32709 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1