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CVE-2026-40405

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CVE-2026-40405

Published: May 12, 2026

Modified: Jun 5, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

Description

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

VendorProductVersions

Microsoft

Windows 11 Version 24H2

affected
10.0.26100.0 - < 10.0.26100.8457

Microsoft

Windows 11 Version 25H2

affected
10.0.26200.0 - < 10.0.26200.8457

Microsoft

Windows 11 version 26H1

affected
10.0.28000.0 - < 10.0.28000.2113

Microsoft

Windows Server 2025

affected
10.0.26100.0 - < 10.0.26100.32860

Microsoft

Windows Server 2025 (Server Core installation)

affected
10.0.26100.0 - < 10.0.26100.32860

Weaknesses (CWE)

CWE-476

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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