CVE-2026-40405 HIGH

CVE-2026-40405: Windows TCP/IP Denial of Service Vulnerability

Vendor Microsoft
Product Windows 11 Version 24H2
Weakness CWE-476
Published May 12, 2026
Last update June 9, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
June 9, 2026 Record updated