PT-2026-40144 · Microsoft · Windows Tcp/Ip+1

Published 2026-05-12 · Updated 2026-05-15 · CVE-2026-33837

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 TCP/IP (affected versions not specified)

Description A heap-based buffer overflow in the tcpip.sys driver allows an authorized low-privilege attacker to perform a local privilege escalation to the kernel level. A heap-based buffer overflow occurs when a program writes more data to a heap-allocated memory block than it can hold, potentially corrupting adjacent memory.

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

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2026-06632

CVE-2026-33837

Affected Products

Windows

Windows Tcp/Ip

References · 7

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33837 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-33837 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33837 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33837 · Security Note
• https://bdu.fstec.ru/vul/2026-06632 · Security Note
• https://twitter.com/windowsforum/status/2054305156645179732 · Twitter Post
• https://twitter.com/f1tym1/status/2055171269708951707 · Twitter Post