CVE-2025-40938: Siemens SIMATIC CN 4100

Hard-coded credentials in Siemens SIMATIC CN 4100

CVSS 9.2 CriticalCriticalEPSS 0.0038 · 31st percentile

Critical, because:

CVSS score 9.2: 9.0 or more.

Published by the CVE Program (CNA: siemens) at 9 Dec 2025, 10:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Siemens	SIMATIC CN 4100	affected before V4.0.1 custom Other versions: unknown

Identifiers

CVE-2025-40938

CNA

siemens

Weakness (CWE)

CWE-798

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.1	High	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (siemens)
9.2	Critical	4.0	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	CNA (siemens)Used for this record

CISA KEV Not listed.
EPSS 0.0038, the 31st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 9 Dec 2025. New records show when each source confirmed them.

Sources

References from the CNA

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

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.