Vulnerability Description
Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.
CVSS Score
9.6
CRITICAL
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 21H2 | < 10.0.19044.7417 |
| Microsoft | Windows 10 22H2 | < 10.0.19045.7417 |
| Microsoft | Windows 11 23H2 | < 10.0.22631.7219 |
| Microsoft | Windows 11 24H2 | < 10.0.26100.8655 |
| Microsoft | Windows 11 25H2 | < 10.0.26200.8655 |
| Microsoft | Windows 11 26H1 | < 10.0.28000.2269 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5256 |
| Microsoft | Windows Server 2025 | < 10.0.26100.32995 |
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-42904?
CVE-2026-42904 is a vulnerability with a CVSS score of 9.6 (CRITICAL). Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.
How severe is CVE-2026-42904?
CVE-2026-42904 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-42904?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 21H2, Microsoft Windows 10 22H2, Microsoft Windows 11 23H2, Microsoft Windows 11 24H2, Microsoft Windows 11 25H2.