CVE-2025-40937Network attack vector

Authenticated code execution via REST command injection

Published Dec 9, 2025 · Updated Dec 9, 2025

Command injection in Siemens SIMATIC CN 4100 before 4.0.1 allows remote authenticated users to execute code with limited privileges. The REST API fails to validate input parameters and improperly handles unexpected arguments, but Siemens does not identify the affected endpoint or command-construction path. Network access and authentication are required; successful exploitation runs attacker-controlled code with limited device privileges.

CVSS severity8.7
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Siemens SIMATIC CN 4100 before 4.0.1 allows remote authenticated users to execute code with limited privileges. The REST API fails to validate input parameters and improperly handles unexpected arguments, but Siemens does not identify the affected endpoint or command-construction path. Network access and authentication are required; successful exploitation runs attacker-controlled code with limited device privileges.

The record

CVE
CVE-2025-40937
Published
Dec 9, 2025
Updated
Dec 9, 2025
Vendor
Siemens
Product
SIMATIC CN 4100
Classifications
CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V4.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC CN 4100version=0 <V4.0.1

Published CVSS scores

8.7Siemens AGCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.3Siemens AGCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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