Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. May 13, 2025 · Catalog

   Detected

   Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.

2. May 13, 2025 · CISA KEV

   Known exploited

   Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

3. Jun 3, 2025 · CISA KEV

   Remediation due

   Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

4. Jun 17, 2026 · Catalog

   Updated

   Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.

Affected

• cpe microsoft/windows 10 1507version unspecified
• cpe microsoft/windows 10 1607version unspecified
• cpe microsoft/windows 10 1809version unspecified
• cpe microsoft/windows 10 21h2version unspecified
• cpe microsoft/windows 10 22h2version unspecified
• cpe microsoft/windows 11 22h2version unspecified
• cpe microsoft/windows 11 23h2version unspecified
• vendor Microsoft Windowsversion unspecified

Sources

• CISA KEVConfirmed exploitationCVE-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.gov
• CVE.orgVulnerability recordCVE-2025-32709

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2025-32709

  30-day exploitation probability 1.8%

  first.org
• NIST NVDVulnerability recordCVE-2025-32709

  Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

  nvd.nist.gov

References

• CISA note · msrc.microsoft.com
• Vendor Advisory · msrc.microsoft.com
• CISA note · nvd.nist.gov
• US Government Resource · cisa.gov