CVE-2025-40939

Medium · 4.6

CVSS

4.6

EPSS

0.2%

Published

Dec 9, 2025

CISA due date

—

The record

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.

Affected packages

Ecosystem	Package	Introduced	Fixed