CVE-2025-40820
High · 7.5CVSS
7.5
EPSS
0.5%
Published
Dec 9, 2025
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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