CVE-2026-40405
HIGHCVSS 7.5/10EPSS 1.08%
Last modified
CVE-2026-40405 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.
Description
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 11 24h2 | < 10.0.26100.8390 |
| Microsoft | Windows 11 25h2 | < 10.0.26200.8390 |
| Microsoft | Windows 11 26h1 | < 10.0.28000.2113 |
| Microsoft | Windows Server 2025 | < 10.0.26100.32772 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-40405?
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.
How severe is CVE-2026-40405?
CVE-2026-40405 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.
How do I fix CVE-2026-40405?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-40405?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST