What is CVE-2025-40940?

CVE-2025-40940 is a medium-severity vulnerability in Siemens Simatic Cn 4100, classified under Information Disclosure. CVSS score: 4.9/10. Published 2025-12-09.

How severe is CVE-2025-40940?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Information disclosure in Siemens Simatic Cn 4100

CVE-2025-40940

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected application exhibits inconsistent SNMP behavior, such as unexpected service availability and unreliable configuration handling across protocol ver…

Vulnerability class: Information Disclosure

EPSS: 0.000 (12.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

Affected products

Siemens Simatic Cn 4100 — versions 0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

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

Frequently asked questions

What is CVE-2025-40940?: CVE-2025-40940 is a medium-severity vulnerability in Siemens Simatic Cn 4100, classified under Information Disclosure. CVSS score: 4.9/10. Published 2025-12-09.
How severe is CVE-2025-40940?: Medium severity. CVSS v3 base score is 4.9 out of 10.