High severity · published Dec 9, 2025
CVE-2025-40937
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1)
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected application do not properly validate input parameters in its REST API, resulting in improper handling of unexpected arguments.
This could allow an authenticated attacker to execute arbitrary code with limited privileges.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SC
Simatic CN 4100 Firmware · Siemens
before 4.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-40937
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-40937
Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-416652.html
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