Use of hard-coded credentials in SIMATIC CN 4100 - CVE-2025-40938
Published: December 10, 2025
Vulnerability identifier: #VU119799
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-40938
CWE-ID: CWE-798
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain full access to vulnerable system.
The vulnerability exists due to presence of hard-coded credentials in application code. A remote unauthenticated attacker can access the affected system using the hard-coded credentials.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
SIMATIC CN 4100
How to mitigate CVE-2025-40938
Install updates from vendor's website.
SIMATIC CN 4100 - update to 4.0.1