CVE-2025-40820

HighCVSS 7.5/10Last modified Oct 7, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

Affected software

No affected versions have been published.

Timeline

Published
Dec 9, 2025
Last modified
Oct 7, 2026
NVD status
Deferred

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CVE-2025-40820: High severity, CVSS 7.5 | Vulnix