Null Pointer Dereference in Windows TCP/IP Affects Microsoft Software
CVE-2026-40413

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-2026-40413?

A vulnerability in Windows TCP/IP could allow an unauthorized attacker to exploit a null pointer dereference, leading to a denial of service condition across adjacent networks. This security flaw affects multiple versions of Windows, potentially disrupting service continuity and availability.

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

.