What is CVE-2025-40938?

CVE-2025-40938 is a high-severity vulnerability in Siemens Simatic Cn 4100, classified under Use of Hard-coded Credentials. CVSS score: 8.1/10. Published 2025-12-09.

How severe is CVE-2025-40938?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Siemens Simatic Cn 4100

CVE-2025-40938

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…

EPSS: 0.000 (15.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Siemens Simatic Cn 4100 — versions 0

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

cert-portal.siemens.com/productcert/html/ssa-416652.html

Frequently asked questions

What is CVE-2025-40938?: CVE-2025-40938 is a high-severity vulnerability in Siemens Simatic Cn 4100, classified under Use of Hard-coded Credentials. CVSS score: 8.1/10. Published 2025-12-09.
How severe is CVE-2025-40938?: High severity. CVSS v3 base score is 8.1 out of 10.