CVE-2025-40938

Critical · 9.8

CVSS

9.8

EPSS

0.4%

Published

Dec 9, 2025

CISA due date

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The record

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device stores sensitive information in the firmware. This could allow an attacker to access and misuse this information, potentially impacting the device’s confidentiality, integrity, and availability.

Affected packages

Ecosystem	Package	Introduced	Fixed