What is CVE-2026-40405?

CVE-2026-40405 is a security advisory published by Microsoft Security Response Center (MSRC) with Denial of Service severity. Windows TCP/IP Denial of Service Vulnerability

Which CVE IDs does CVE-2026-40405 cover?

CVE-2026-40405 covers the following CVE IDs: CVE-2026-40405. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40405?

CVE-2026-40405 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

CVE-2026-40405Denial of ServiceCVSS 7.5

Windows TCP/IP Denial of Service Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-40405 →

📋 Description

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