CVE-2026-40405

HIGH

Microsoft Windows TCP/IP - Null Pointer Denial of Service

Title source: manual
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Windows TCP/IP Denial of Service Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40405

Scores

CVSS v3 7.5
EPSS 0.0015
EPSS Percentile 35.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (9)
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.8457
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.8457
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2113
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.32860
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32860
microsoft/windows_11_24h2 < 10.0.26100.8390 (2 CPE variants)
microsoft/windows_11_25h2 < 10.0.26200.8390 (2 CPE variants)
microsoft/windows_11_26h1 < 10.0.28000.2113 (2 CPE variants)
microsoft/windows_server_2025 < 10.0.26100.32772
Published May 12, 2026
Tracked Since May 12, 2026