CVE-2025-40939 MEDIUM

CVE-2025-40939

Vendor Siemens
Product SIMATIC CN 4100
Weakness CWE-284
Published December 9, 2025
Last update December 9, 2025
View on NVD All CVEs

CVSS base score

4.6/10
Attack vector Physical
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device contains a USB port which allows unauthenticated connections. This could allow an attacker with physical access to the device to trigger reboot that could cause denial of service condition.

Key dates

02Disclosure timeline

December 9, 2025 CVE published
December 9, 2025 Record updated