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CVE-2025-40759

HIGH
7.8
CVSS Score
Published: August 12, 2025 at 11:17 AM UTC
Updated: October 13, 2026 at 10:17 AM UTC
12 products affected across 1 vendorSINAMICS StartdriveSIRIUS Safety ESSIMATIC WinCC

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

A vulnerability has been identified in SIMATIC S7-PLCSIM V17 (All versions), SIMATIC STEP 7 V17 (All versions), SIMATIC STEP 7 V18 (All versions), SIMATIC STEP 7 V19 (All versions < V19 Update 4), SIMATIC STEP 7 V20 (All versions), SIMATIC WinCC V17 (All versions), SIMATIC WinCC V18 (All versions), SIMATIC WinCC V19 (All versions < V19 Update 4), SIMATIC WinCC V20 (All versions), SIMOCODE ES V17 (All versions), SIMOCODE ES V18 (All versions), SIMOCODE ES V19 (All versions), SIMOCODE ES V20 (All versions), SIMOTION SCOUT TIA V5.4 (All versions), SIMOTION SCOUT TIA V5.5 (All versions), SIMOTION SCOUT TIA V5.6 (All versions < V5.6 SP1 HF7), SIMOTION SCOUT TIA V5.7 (All versions), SINAMICS Startdrive V17 (All versions), SINAMICS Startdrive V18 (All versions), SINAMICS Startdrive V19 (All versions), SINAMICS Startdrive V20 (All versions), SIRIUS Safety ES V17 (TIA Portal) (All versions), SIRIUS Safety ES V18 (TIA Portal) (All versions), SIRIUS Safety ES V19 (TIA Portal) (All versions), SIRIUS Safety ES V20 (TIA Portal) (All versions), SIRIUS Soft Starter ES V17 (TIA Portal) (All versions), SIRIUS Soft Starter ES V18 (TIA Portal) (All versions), SIRIUS Soft Starter ES V19 (TIA Portal) (All versions), SIRIUS Soft Starter ES V20 (TIA Portal) (All versions), TIA Portal Cloud V17 (All versions), TIA Portal Cloud V18 (All versions), TIA Portal Cloud V19 (All versions < V5.2.1.1), TIA Portal Cloud V20 (All versions). Affected products do not properly sanitize stored security properties when parsing project files. This could allow an attacker to cause a type confusion and execute arbitrary code within the affected application.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SINAMICS Startdrive· Siemens
95%
018
SIRIUS Safety ES· Siemens
95%
0
SIMATIC S7-plcsim· Siemens
90%
017
SIMATIC Step 7· Siemens
90%
0
Affected range stops below V17 Update 9, so it looks safe — our inference, not a vendor statement
Affected range stops below V19 Update 4, so it looks safe — our inference, not a vendor statement
Affected range stops below V20 Update 4, so it looks safe — our inference, not a vendor statement
SIMATIC WinCC· Siemens
90%
0
Affected range stops below V20 Update 4, so it looks safe — our inference, not a vendor statement
SIMATIC WinCC (TIA Portal)· Siemens
90%
0
Affected range stops below V17 Update 9, so it looks safe — our inference, not a vendor statement
Affected range stops below V19 Update 4, so it looks safe — our inference, not a vendor statement
Simocode Es· Siemens
90%
017
SIMOCODE ES V20· Siemens
90%
0
SIMOTION SCOUT TIA· Siemens
90%
0
Affected range stops below V5.6 SP1 HF7, so it looks safe — our inference, not a vendor statement
SINAMICS Startdrive V17· Siemens
90%
017

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: [email protected]
https://cert-portal.siemens.com/productcert/html/ssa-493396.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHsiemens
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-502

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