CVE-2025-40820 | THREATINT

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.

PUBLISHED Reserved 2025-04-16 | Published 2025-12-09 | Updated 2025-12-09 | Assigner siemens

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

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-940: Improper Verification of Source of a Communication Channel

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References

cert-portal.siemens.com/productcert/html/ssa-915282.html

cve.org (CVE-2025-40820)

nvd.nist.gov (CVE-2025-40820)

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