CVE-2025-40939

Published Dec 9, 2025 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
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
Type Values Removed Values Added
First Time appeared Siemens
Siemens simatic Cn 4100
Vendors & Products Siemens
Siemens simatic Cn 4100
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
siemens
Published
Updated
Dec 9, 2025, 3:26 PM
Reserved
Apr 16, 2025, 9:06 AM
Status
Analyzed
Published
Dec 9, 2025, 4:17 PM
Modified
Oct 23, 2026, 10:10 PM