CVE-2026-40401: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 1607
Windows TCP/IP Denial of Service Vulnerability
AI Analysis
Technical Summary
This vulnerability, identified as CWE-476 (NULL Pointer Dereference), affects the TCP/IP implementation in Microsoft Windows 10 Version 1607 (build 10.0.14393.0). It can be triggered locally to cause a denial of service by crashing the system due to improper handling of NULL pointers. The CVSS v3.1 base score is 7.1, reflecting high severity with local attack vector, low attack complexity, no privileges required, no user interaction, and a scope change. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation results in denial of service by crashing the affected Windows 10 Version 1607 system, impacting system availability. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401 to remediate this vulnerability.
CVE-2026-40401: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 1607
Description
Windows TCP/IP Denial of Service Vulnerability
CVSS v3.1
Score 7.1high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-476 (NULL Pointer Dereference), affects the TCP/IP implementation in Microsoft Windows 10 Version 1607 (build 10.0.14393.0). It can be triggered locally to cause a denial of service by crashing the system due to improper handling of NULL pointers. The CVSS v3.1 base score is 7.1, reflecting high severity with local attack vector, low attack complexity, no privileges required, no user interaction, and a scope change. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation results in denial of service by crashing the affected Windows 10 Version 1607 system, impacting system availability. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-13T00:27:50.798Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401","vendor":"Microsoft"}]
Threat ID: 6a036554cbff5d861008c971
Added to database: 05/12/2026, 17:37:24 UTC
Last enriched: 06/19/2026, 17:38:49 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 56
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