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CVE-2026-40405— Windows TCP/IP Denial of Service Vulnerability

CVSS 7.5 · High EPSS 0.16% · P36

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 5

VendorProductVersion RangeStatus
MicrosoftWindows 11 Version 24H210.0.26100.0< 10.0.26100.8457affected
MicrosoftWindows 11 Version 25H210.0.26200.0< 10.0.26200.8457affected
MicrosoftWindows 11 version 26H110.0.28000.0< 10.0.28000.2113affected
MicrosoftWindows Server 202510.0.26100.0< 10.0.26100.32860affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0< 10.0.26100.32860affected
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I. Basic Information for CVE-2026-40405

Vulnerability Information
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Vulnerability Title
Windows TCP/IP Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
空指针解引用
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Windows TCP/IP 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows TCP/IP是美国微软（Microsoft）公司的一个为Windows提供TCP/IP配置功能的组件。 Microsoft Windows TCP/IP存在代码问题漏洞。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：Windows Server 2025 (Server Core installation),Windows 11 Version 25H2 for ARM64-based Systems,Windows 11 Version 25H2 for
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MicrosoftWindows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.8457 -
MicrosoftWindows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.8457 -
MicrosoftWindows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.2113 -
MicrosoftWindows Server 2025 10.0.26100.0 ~ 10.0.26100.32860 -
MicrosoftWindows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32860 -

II. Public POCs for CVE-2026-40405

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III. Intelligence Information for CVE-2026-40405

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Same Patch Batch · Microsoft · 2026-05-12 · 125 CVEs total

CVE-2026-428989.9 CRITICALMicrosoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-428239.9 CRITICALAzure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-410899.8 CRITICALWindows Netlogon Remote Code Execution Vulnerability
CVE-2026-410969.8 CRITICALWindows DNS Client Remote Code Execution Vulnerability
CVE-2026-403799.3 CRITICALAzure Entra ID Spoofing Vulnerability
CVE-2026-404029.3 CRITICALWindows Hyper-V Elevation of Privilege Vulnerability
CVE-2026-428339.1 CRITICALMicrosoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-331179.1 CRITICALAzure SDK for Java Security Feature Bypass Vulnerability
CVE-2026-411039.1 CRITICALMicrosoft SSO Plugin for Jira & Confluence Elevation of Privilege Vulnerability
CVE-2026-331108.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-403658.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-403708.8 HIGHSQL Server Remote Code Execution Vulnerability
CVE-2026-410948.8 HIGHMicrosoft Data Formulator Remote Code Execution Vulnerability
CVE-2026-354398.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-411098.8 HIGHGitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-404038.8 HIGHWindows Graphics Component Remote Code Execution Vulnerability
CVE-2026-403578.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-354368.8 HIGHMicrosoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-404208.8 HIGHMicrosoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-416138.8 HIGHVisual Studio Code Elevation of Privilege Vulnerability

Showing top 20 of 125 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 11 Version 24H2
Same vendor: Microsoft
Same weakness: CWE-476

V. Comments for CVE-2026-40405

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