CVE-2025-40938 Hardcoded credentials in SIMATIC CN 4100
Attackers can extract sensitive information from the firmware of SIMATIC CN 4100 devices, compromising confidentiality, integrity, and availability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-40938?
CVE-2025-40938 is a critical vulnerability in Siemens SIMATIC CN 4100, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-798
Which versions are affected by CVE-2025-40938?
It affects 1 product.
Products include Siemens Simatic Cn 4100 Firmware.
How do I fix CVE-2025-40938?
No fix has been published for CVE-2025-40938 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-40938 being exploited?
There is no known exploitation of CVE-2025-40938 in the wild and no public exploit code.
Other vulnerabilities in Siemens SIMATIC CN 4100
Sources
Also known as GHSA-6wrx-4m6w-9vw2.