CVE-2026-40401

What it is

Windows TCP/IP Denial of Service Vulnerability

At a glance

Exploitability

Can be exploited locally on the machine without logging in. High risk of service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-12 18:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 10:45 UTC Last updatedMost recent change to the record

Details

Published

2026-05-12 18:17 UTC

Last modified

2026-06-17 10:45 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-476 · NULL pointer dereference

Record status

Modified

Affected

• Microsoft Windows 10 1607 < 10.0.14393.9140
• Microsoft Windows 10 1809 < 10.0.17763.8755
• Microsoft Windows 10 21h2 < 10.0.19044.7291
• Microsoft Windows 10 22h2 < 10.0.19045.7291
• Microsoft Windows 11 23h2 < 10.0.22631.7079
• Microsoft Windows 11 24h2 < 10.0.26100.8390
• Microsoft Windows 11 25h2 < 10.0.26200.8390
• Microsoft Windows 11 26h1 < 10.0.28000.2113

Attack profile CVSS 3.1 · 7.1

Attack vector

Local

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High