PT-2026-32799 · Microsoft · Windows Ancillary Function Driver For Winsock+1

Published 2026-04-14 · Updated 2026-04-17 · CVE-2026-32073

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/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 use after free race condition in the Windows Ancillary Function Driver for WinSock (afd.sys) allows an authorized attacker to elevate privileges locally.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-05332

CVE-2026-32073

ZDI-26-277

Affected Products

Windows

Windows Ancillary Function Driver For Winsock

References · 7

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32073 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-26-277 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-32073 · Security Note
• https://bdu.fstec.ru/vul/2026-05332 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-32073 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-32073 · Security Note
• https://twitter.com/CVEnew/status/2045112969244414384 · Twitter Post