Deserialization in Siemens Simatic S7-plcsim V17

CVE-2025-40759

A vulnerability has been identified in SIMATIC S7-PLCSIM V17 (All versions), SIMATIC STEP 7 V17 (All versions < V17 Update 9), SIMATIC STEP 7 V18 (All versions), SIMATIC STEP 7 V19 (All versions < V19 Update 4), SIMATIC STEP 7 V20 (All ver…

Vulnerability class: Insecure Deserialization

EPSS: 0.002 (36.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-40759?
CVE-2025-40759 is a high-severity vulnerability in Siemens Simatic S7-plcsim V17, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2025-08-12.
How severe is CVE-2025-40759?
High severity. CVSS v3 base score is 7.8 out of 10.