Use-after-free in Microsoft Windows and Windows Server - CVE-2025-32709

Vulnerability identifier: #VU109051

CSH Severity: High

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-32709

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: The vulnerability is being exploited in the wild

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in Windows Ancillary Function Driver for WinSock. A local user can execute arbitrary code with SYSTEM privileges. 

Note, the vulnerability is being actively exploited in the wild.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.5854, 10 22H2 10.0.19045.5854, 10 1507 10.0.10240.21014, 10 1607 10.0.14393.8066, 10 1809 10.0.17763.7314, 11 22H2 10.0.22621.5335, 11 23H2 10.0.22631.5335, 11 24H2 10.0.26100.3981, 11 24H2 10.0.26100.4061
Windows Server - addressed in versions 2012 R2 6.3.9600.22577, 2012 6.2.9200.25475, 2016 10.0.14393.8066, 2019 10.0.17763.7314, 2022 23H2 10.0.25398.1611, 2022 10.0.20348.3630, 2022 10.0.20348.3692, 2025 10.0.26100.3981, 2025 10.0.26100.4061

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-32709

• Privilege escalation in Microsoft Windows ancillary function driver for WinSock