CVE-2025-40939

low-risk
Published 2025-12-09

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device contains a USB port which allows unauthenticated connections. This could allow an attacker with physical access to the device to trigger reboot that could cause denial of service condition.

Do I need to act?

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0.06% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.6/10 Medium
PHYSICAL / LOW complexity

Affected Products (1)

Simatic Cn 4100 Firmware

Affected Vendors

Siemens

References (1)

Vendor Advisory https://cert-portal.siemens.com/productcert/html/ssa-416652.html
21
/ 100
low-risk
Severity 16/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal