PT-2025-21010 · Microsoft · Windows Server 2016+9

Published 2025-05-13 · Updated 2025-10-20 · CVE-2025-32709

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Ancillary Function Driver for WinSock (affected versions not specified)

Description The issue is related to a use-after-free vulnerability in the Windows Ancillary Function Driver for WinSock, which allows an authorized attacker to elevate privileges locally. This vulnerability is actively being exploited.

Recommendations As a temporary workaround, consider disabling the vulnerable function until a patch is available. Apply the May 2025 patch KB5034441 urgently to resolve the issue.

Fix

LPE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2025-05437

CVE-2025-32709

Affected Products

Windows

Windows 10

Windows 11

Windows Ancillary Function Driver For Winsock

Windows Server 2016

Windows Server 2017

Windows Server 2018

Windows Server 2019

Windows Server 2020

Windows Server 2022

References · 46

• https://safe-surf.ru/specialists/bulletins-nkcki/721014 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-32709 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-32709 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-05437 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-32709 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-32709 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-32709 · Security Note
• https://osv.dev/vulnerability/CVE-2025-32709 · Vendor Advisory
• https://t.me/avleonovcom/1535 · Telegram Post
• https://twitter.com/ScyScan/status/1922412020189794713 · Twitter Post
• https://twitter.com/transilienceai/status/1922810149665677675 · Twitter Post
• https://twitter.com/transilienceai/status/1923354701556248885 · Twitter Post
• https://twitter.com/syedaquib77/status/1922475845740011795 · Twitter Post
• https://twitter.com/transilienceai/status/1925888885852098632 · Twitter Post
• https://twitter.com/ZeroPathLabs/status/1922483566962708805 · Twitter Post