CVE-2025-40938

HIGH

Siemens Simatic CN 4100 Firmware < 4.0.1 - Hard-coded Credentials

Title source: rule

Description

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device stores sensitive information in the firmware. This could allow an attacker to access and misuse this information, potentially impacting the device’s confidentiality, integrity, and availability.

References (1)

[Vendor Advisory] https://cert-portal.siemens.com/productcert/html/ssa-416652.html

Scores

CVSS v3 8.1

EPSS 0.0008

EPSS Percentile 24.4%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-798

Status published

Products (1)

siemens/simatic_cn_4100_firmware < 4.0.1

Published Dec 09, 2025

Tracked Since Feb 18, 2026