---
id: CVE-2025-40938
title: A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1)
summary: >-
  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 t…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-798
vendor: siemens
product: simatic_cn_4100_firmware
affected:
  - simatic_cn_4100_firmware < 4.0.1
patched:
  - simatic_cn_4100_firmware 4.0.1
published: '2025-12-09'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:10:01.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40938'
references:
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-416652.html'
    label: productcert@siemens.com
tags:
  - nvd
epss: 0.00377
epssPercentile: 0.2943
ingestedAt: '2026-10-07T20:46:46.791Z'
---

## Overview

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.

## Affected

- `simatic_cn_4100_firmware < 4.0.1`

## Remediation

Upgrade past the affected range:

- `simatic_cn_4100_firmware 4.0.1`