PT-2025-42125 · Microsoft · Windows Ancillary Function Driver For Winsock+1

Published 2025-10-14 · Updated 2025-10-14 · CVE-2025-59242

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 A heap-based buffer overflow exists in the Windows Ancillary Function Driver for WinSock. This issue allows a locally authorized attacker to elevate privileges.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Integer Underflow

Heap Based Buffer Overflow

Weakness Enumeration

CWE-191

CWE-122

Related Identifiers

BDU:2025-13098

CVE-2025-59242

Affected Products

Windows

Windows Ancillary Function Driver For Winsock

References · 7

• https://osv.dev/vulnerability/CVE-2025-59242 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-59242 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-59242 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59242 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-59242 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-13098 · Security Note
• https://twitter.com/CVEnew/status/1978198244065763668 · Twitter Post