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Vendor advisorySeverity 7.8 high
SSA-493396: Deserialization Vulnerability in Siemens Engineering Platforms
SSA-493396 · Siemens · August 12, 2025
Summary
Affected products do not properly sanitize user-controllable input when parsing project files. This could allow an attacker to cause a type confusion and execute arbitrary code within the affected application.
Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available.
From Siemens (vendor's own words, quoted), quoted as published. Check the source before acting.
What to do
Only open projects from trusted sources.
Currently no fix is planned
Currently no fix is available
Update to V17 Update 9 or later version
Vendor fix or mitigation, quoted from the advisory.
Each CVE in this advisory
| CVE | Severity | Known exploited | Exploit likelihood |
|---|---|---|---|
| CVE-2025-40759 | 7.8 high | No | 0.2% |
Severity from the advisory (CVSS), known exploitation from CISA's catalog, exploit likelihood from EPSS (next 30 days).
Affected products
| Vendor | Product |
|---|---|
| Siemens | SIMATIC S7-PLCSIM V17 |
| Siemens | SIMATIC STEP 7 V17 |
| Siemens | SIMATIC STEP 7 V18 |
| Siemens | SIMATIC STEP 7 V19 |
| Siemens | SIMATIC STEP 7 V20 |
| Siemens | SIMATIC WinCC V17 |
| Siemens | SIMATIC WinCC V18 |
| Siemens | SIMATIC WinCC V19 |
| Siemens | SIMATIC WinCC V20 |
| Siemens | SIMOCODE ES V17 |
| Siemens | SIMOCODE ES V18 |
| Siemens | SIMOCODE ES V19 |
| Siemens | SIMOCODE ES V20 |
| Siemens | SIMOTION SCOUT TIA V5.4 |
| Siemens | SIMOTION SCOUT TIA V5.5 |
| Siemens | SIMOTION SCOUT TIA V5.6 |
| Siemens | SIMOTION SCOUT TIA V5.7 |
| Siemens | SINAMICS Startdrive V17 |
| Siemens | SINAMICS Startdrive V18 |
| Siemens | SINAMICS Startdrive V19 |
| Siemens | SINAMICS Startdrive V20 |
| Siemens | SIRIUS Safety ES V17 (TIA Portal) |
| Siemens | SIRIUS Safety ES V18 (TIA Portal) |
| Siemens | SIRIUS Safety ES V19 (TIA Portal) |
| Siemens | SIRIUS Safety ES V20 (TIA Portal) |
| Siemens | SIRIUS Soft Starter ES V17 (TIA Portal) |
| Siemens | SIRIUS Soft Starter ES V18 (TIA Portal) |
| Siemens | SIRIUS Soft Starter ES V19 (TIA Portal) |
| Siemens | SIRIUS Soft Starter ES V20 (TIA Portal) |
| Siemens | TIA Portal Cloud V17 |
| Siemens | TIA Portal Cloud V18 |
| Siemens | TIA Portal Cloud V19 |
| Siemens | TIA Portal Cloud V20 |
Why it's on these mode pages
- Maritime: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Pipeline: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Freight rail: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Passenger rail and transit: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Highway and motor carrier: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Postal and parcel: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
Change history
- August 12, 2025: Publication Date
- October 14, 2025: Added fix for TIA Portal V20
- December 9, 2025: Added fix for Totally Integrated Automation Portal (TIA Portal) V17
- October 13, 2026: Added fix version for SIMATIC STEP 7 V18, and SIMATIC WinCC V18
- November 9, 2026: First collected by Watch
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