CVE-2025-40939 — MEDIUM (4.6)

Q: How severe is CVE-2025-40939?

CVE-2025-40939 has been rated MEDIUM with a CVSS base score of 4.6/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2025-40939?

Check the references section above for vendor advisories and patch information. Affected products include: Siemens Simatic Cn 4100 Firmware, Siemens Simatic Cn 4100.

Vulnerability Description

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.

CVSS Score

4.6

MEDIUM

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

PHYSICAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Siemens	Simatic Cn 4100 Firmware	< 4.0.1
Siemens	Simatic Cn 4100	-

Related Weaknesses (CWE)

CWE-284

References

https://cert-portal.siemens.com/productcert/html/ssa-416652.htmlVendor Advisory

FAQ

What is CVE-2025-40939?

CVE-2025-40939 is a vulnerability with a CVSS score of 4.6 (MEDIUM). 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 phys...

How severe is CVE-2025-40939?

CVE-2025-40939 has been rated MEDIUM with a CVSS base score of 4.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-40939?

Check the references section above for vendor advisories and patch information. Affected products include: Siemens Simatic Cn 4100 Firmware, Siemens Simatic Cn 4100.