CVE-2026-42904
CRITICALCVSS 9.6/10EPSS 0.44%
Last modified
CVE-2026-42904 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.
Description
Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| 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 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-42904?
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 a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.
How do I fix CVE-2026-42904?
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.
Are you affected by CVE-2026-42904?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST