CVE-2025-40941 Information disclosure in SIMATIC CN 4100

What is CVE-2025-40941?

CVE-2025-40941 is a medium-severity vulnerability in Siemens SIMATIC CN 4100, published on 9 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected devices exposes server information in its responses. This could allow an attacker with network access to gain useful information, increasing the likelihood of targeted attacks.

Weakness: CWE-200

Which versions are affected by CVE-2025-40941?

It affects 1 product.

Products include Siemens Simatic Cn 4100 Firmware.

How do I fix CVE-2025-40941?

No fix has been published for CVE-2025-40941 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-40941 being exploited?

There is no known exploitation of CVE-2025-40941 in the wild and no public exploit code.

Other vulnerabilities in Siemens SIMATIC CN 4100

• CVE-2024-32741 Hardcoded credentials in SIMATIC CN 4100 Critical 10.0
• CVE-2023-29130 Privilege escalation in SIMATIC CN 4100 Critical 9.9
• CVE-2024-32740 Hardcoded credentials in SIMATIC CN 4100 Critical 9.8
• CVE-2023-49621 Hardcoded credentials in SIMATIC CN 4100 Critical 9.8
• CVE-2025-40938 Hardcoded credentials in SIMATIC CN 4100 Critical 9.2

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-4cw5-4fh5-2c5q.