P5Verified

CVE-2025-40939: simatic cn 4100 firmware before 4.0.1 (exclusive); +1 more affected products

CVE-2025-40939. CVSS 3.1 base score 4.6 (MEDIUM, Vendor/CNA). EPSS 0.00213 (percentile 0.10581), scored 2026-10-06.

Affected technology

simatic cn 4100 firmware · before 4.0.1 (exclusive)
siemens

SIMATIC CN 4100 · 0 to before V4.0.1
Siemens

Description’s affected range: versions < V4.0.1)

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Physical access · No privileges required · No user interaction required

What an attacker can do

An attacker with physical access to the device could trigger reboot that could cause denial of service condition. Vendor/CNA’s CVSS 4.0 assessment (base score 5.1/10) rates confidentiality and integrity impact as none; availability impact as high.

Published 2026-10-07 23:05:59.427297+00:00

CWE: CWE-284
CCR priority: 18.5 /100 (P5)
CVSS 3.1: 4.6 /10 · CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · Vendor/CNA
EPSS: 0.00213 · percentile 0.10581 · 2026-10-06
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-07 23:02:50.240617+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2025-40939.html