CVE-2025-32709: Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability

CVE-2025-32709 · Severity: critical · CVSS 7.8 · Exploited in the wild · Published 2025-05-13

A use-after-free vulnerability in the Microsoft Windows Ancillary Function Driver (AFD) for WinSock allows a locally authenticated attacker to escalate privileges to Administrator. The flaw was also described as a null pointer dereference in some documentation updates.

Technologies: Microsoft Windows. Vendors: Microsoft.

Quick answers

Is CVE-2025-32709 exploited in the wild?
Yes. CVE-2025-32709 is known to be exploited in the wild, first recorded on 13 May 2025. Treat it as urgent.
How severe is CVE-2025-32709?
Critical severity, with a CVSS score of 7.8, published 13 May 2025.
Which products and versions are affected?
Microsoft Windows 10 up to (excluding) 10.0.19045.5854; Microsoft Windows 11 up to (excluding) 10.0.26100.4061; Microsoft Windows Server 2012 All; Microsoft Windows Server 2016 up to (excluding) 10.0.14393.8066; and 3 more.
Is there a fix for CVE-2025-32709?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2025-32709 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2025-32709?
Check whether you run Microsoft Windows. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft Windows 10 up to (excluding) 10.0.19045.5854
  • Microsoft Windows 11 up to (excluding) 10.0.26100.4061
  • Microsoft Windows Server 2012 All
  • Microsoft Windows Server 2016 up to (excluding) 10.0.14393.8066
  • Microsoft Windows Server 2019 up to (excluding) 10.0.17763.7314
  • Microsoft Windows Server 2022 up to (excluding) 10.0.20348.3692
  • Microsoft Windows Server 2025 up to (excluding) 10.0.26100.4061

Timeline

  • 2025-05-13: disclosed
  • 2025-05-13: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2025-05-13: exploited: Reported as exploited in the wild at time of publication.

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