CVE-2026-40401: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 1607
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40401) affects the TCP/IP implementation in Windows 10 Version 1607 (build 10.0.14393.0). It is caused by a null pointer dereference condition that can be exploited by an unauthorized local attacker to cause a denial of service, effectively crashing or destabilizing the affected system. The CVSS v3.1 base score is 7.1, reflecting high severity due to the local attack vector and high impact on availability. Microsoft has released an official patch to remediate this vulnerability.
Potential Impact
The vulnerability allows an unauthorized attacker with local access to cause a denial of service by triggering a null pointer dereference in the Windows TCP/IP stack. 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 provided security update as soon as possible to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401 for patch details and installation instructions.
CVE-2026-40401: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 1607
Description
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40401) affects the TCP/IP implementation in Windows 10 Version 1607 (build 10.0.14393.0). It is caused by a null pointer dereference condition that can be exploited by an unauthorized local attacker to cause a denial of service, effectively crashing or destabilizing the affected system. The CVSS v3.1 base score is 7.1, reflecting high severity due to the local attack vector and high impact on availability. Microsoft has released an official patch to remediate this vulnerability.
Potential Impact
The vulnerability allows an unauthorized attacker with local access to cause a denial of service by triggering a null pointer dereference in the Windows TCP/IP stack. 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 provided security update as soon as possible to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401 for patch details and installation instructions.
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: 5/12/2026, 5:37:24 PM
Last enriched: 5/12/2026, 6:51:32 PM
Last updated: 5/13/2026, 4:49:48 AM
Views: 2
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