Resource exhaustion in Siemens Simatic Et 200al Im 157-1 Pn

CVE-2025-40944

A vulnerability has been identified in SIMATIC ET 200AL IM 157-1 PN (6ES7157-1AB00-0AB0) (All versions), SIMATIC ET 200MP IM 155-5 PN HF (6ES7155-5AA00-0AC0) (All versions >= V4.2.0), SIMATIC ET 200SP IM 155-6 MF HF (6ES7155-6MU00-0CN0) (A…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.000 (6.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-40944?
CVE-2025-40944 is a high-severity vulnerability in Siemens Simatic Et 200al Im 157-1 Pn, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-01-13.
How severe is CVE-2025-40944?
High severity. CVSS v3 base score is 7.5 out of 10.