PT-2026-40215 · Microsoft · Windows Tcp/Ip+1

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-40401

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Windows TCP/IP (affected versions not specified)

Description A null pointer dereference in Windows TCP/IP allows an unauthorized attacker to cause a denial of service locally. A null pointer dereference occurs when a program attempts to read or write to a memory address that is null, typically leading to a system crash.

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

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2026-06658

CVE-2026-40401

Affected Products

Windows

Windows Tcp/Ip

References · 6

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40401 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-40401 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40401 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06658 · Security Note
• https://feedly.com/cve/CVE-2026-40401 · Note