Windows TCP/IP Denial of Service Vulnerability in Microsoft Software
CVE-2026-40414

7.4HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Vendor
CVE Published:
12 May 2026

What is CVE-2026-40414?

A null pointer dereference vulnerability in the Windows TCP/IP stack allows unauthorized attackers to exploit the system by causing a denial of service. This vulnerability enables attackers to disrupt communications and hinder service availability across adjacent networks, posing significant risks to organizational operations and network integrity.

Affected Version(s)

Windows 10 Version 1607 x64-based Systems 10.0.14393.0 < 10.0.14393.9140

Windows 10 Version 1809 x64-based Systems 10.0.17763.0 < 10.0.17763.8755

Windows 10 Version 21H2 x64-based Systems 10.0.19044.0 < 10.0.19044.7291

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.