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CVE-2025-32709 · Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

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

Severity
Important
Impact
Elevation of Privilege
CVSS
7.8 base · 6.8 temporal
Release
2025-05-13
Signals
Windows Ancillary Function Driver for WinSock Elevation of Privilege Exploited: Yes Publicly disclosed: No Exploitability: Exploitation Detected
CWE
CWE-416: Use After Free
Patch Diff
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Resolved binary override
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Description
Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
FAQ / Articles
FAQ
What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could gain administrator privileges.
FAQ
I am running Windows Server 2008 or Windows Server 2008 R2. How do I protect my system from this vulnerability? The protections for this vulnerability are not included in the following May 2025 monthly rollup or security-only updates released on May 13, 2025: Windows Server 2008 R2: KB5058454 (Security-only update) Windows Server 2008 R2: KB5058430 (Monthly Rollup) Windows Server 2008: KB5058429 (Security-only update) Windows Server 2008: KB5058449 (Monthly Rollup) Instead, customers running these versions of Windows Server need to install the following Out-of-Band (OOB) updates, released also on May 13, 2025, as applicable: Windows Server 2008 R2: KB5061195 (Security-only update) Windows Server 2008 R2: KB5061196 (Monthly Rollup) Windows Server 2008: KB5061197 (Security-only update) Windows Server 2008: KB5061198 (Monthly Rollup) Note These OOB updates are cumulative, so if you haven't already installed the May 2025 monthly rollup or security-only updates, you can install the applicable OOB update directly. If you have already installed the May 2025 monthly rollup or security-only updates, you need to also install the OOB updates to be protected from this vulnerability.