How severe is CVE-2025-40937?

CVE-2025-40937 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2025-40937 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-40937?

CVE-2025-40937 affects Siemens Simatic Cn 4100 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-40937?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-40937 have an EU (EUVD) identifier?

Yes. CVE-2025-40937 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201919.

When was CVE-2025-40937 published?

CVE-2025-40937 was published on 2025-12-09 and last updated on 2026-06-17.

CVE-2025-40937

CVE-2025-40937 is a high-severity vulnerability in Siemens Simatic Cn 4100 Firmware with a CVSS 3.x base score of 8.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: High (CVSS 3.x base score 8.3)
CVSS v4: 8.7
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201919
Weakness: CWE-77
Affected product: Siemens Simatic Cn 4100 Firmware
Published: 2025-12-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-40937?: 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.
How severe is CVE-2025-40937?: CVE-2025-40937 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2025-40937 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-40937?: CVE-2025-40937 affects Siemens Simatic Cn 4100 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-40937?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-40937 have an EU (EUVD) identifier?: Yes. CVE-2025-40937 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201919.
When was CVE-2025-40937 published?: CVE-2025-40937 was published on 2025-12-09 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/html/ssa-416652.html

Affected products (1)

cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*

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