CVE-2025-40820
HIGHDescription
Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to interfere with connection setup, potentially leading to a denial of service. The attack succeeds only if an attacker can inject IP packets with spoofed addresses at precisely timed moments, and it affects only TCP-based services.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 35% of all known CVEs.
References
Related Vulnerabilities
Other CWE-940 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2025-61932 | Critical | 9.8 | 2.6% | KEV | - |
| CVE-2024-32388 | Medium | 5.3 | 1.5% | - | Fix |
| CVE-2023-3663 | High | 8.8 | 1.0% | - | Fix |
| CVE-2023-48387 | High | 8.8 | 1.0% | - | - |
| CVE-2025-23018 | Medium | 5.4 | 1.0% | - | - |
| CVE-2025-23019 | Medium | 5.4 | 0.9% | - | - |
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-09.