CVE-2025-40939

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.

• CWE-284

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

Published

Dec 9, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

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