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.

Attack Vector Physical

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Physical

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00027.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Siemens SIMATIC CN 4100 unknown
Version Status Constraints
0 affected
< V4.0.1

Configuration 1 [-]

AND
cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:*

No data.

Vendor Product Confidence Versions
Siemens Simatic Cn 4100 — —

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Subscriptions

Vendors Products
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Tracking

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cert-portal.siemens.com/productcert/html/ssa-416652.html cve-icon cve-icon
History

Tue, 16 Dec 2025 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Siemens simatic Cn 4100 Firmware
CPEs cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*
Vendors & Products Siemens simatic Cn 4100 Firmware

Wed, 10 Dec 2025 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Siemens
Siemens simatic Cn 4100
Vendors & Products Siemens
Siemens simatic Cn 4100

Tue, 09 Dec 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 09 Dec 2025 11:00:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 4.6, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: siemens

Published:

Updated: 2025-12-09T15:26:06.742Z

Reserved: 2025-04-16T09:06:15.878Z

Link: CVE-2025-40939

cve-icon Vulnrichment

Updated: 2025-12-09T15:21:19.221Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-09T16:17:47.617

Modified: 2025-12-16T17:30:28.147

Link: CVE-2025-40939

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-10T17:52:29Z

Weaknesses