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Vulnerability · Published Aug 12, 2025 · Assigned by siemens

CVE-2025-40759

High 7.8

In plain English

A high-severity unsafe deserialization in SIMATIC S7-PLCSIM V17 from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 89.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 < V18 Update 6), SIMATIC STEP 7 V19 (All versions < V19 Update 4), SIMATIC STEP 7 V20 (All versions < V20 Update 4), SIMATIC WinCC V17 (All versions < V17 Update 9), SIMATIC WinCC V18 (All versions < V18 Update 6), SIMATIC WinCC V19 (All versions < V19 Update 4), SIMATIC WinCC V20 (All versions < V20 Update 4), 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 < V5.2.2.2). 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 products (as reported)

VendorProductVersions
Siemens SIMATIC S7-PLCSIM V17 0 – before *
Siemens SIMATIC STEP 7 V17 0 – before V17 Update 9
Siemens SIMATIC STEP 7 V18 0 – before V18 Update 6
Siemens SIMATIC STEP 7 V19 0 – before V19 Update 4
Siemens SIMATIC STEP 7 V20 0 – before V20 Update 4
Siemens SIMATIC WinCC V17 0 – before V17 Update 9
Siemens SIMATIC WinCC V18 0 – before V18 Update 6
Siemens SIMATIC WinCC V19 0 – before V19 Update 4
Siemens SIMATIC WinCC V20 0 – before V20 Update 4
Siemens SIMOCODE ES V17 0 – before *
Siemens SIMOCODE ES V18 0 – before *
Siemens SIMOCODE ES V19 0 – before *
Siemens SIMOCODE ES V20 0 – before *
Siemens SIMOTION SCOUT TIA V5.4 0 – before *
Siemens SIMOTION SCOUT TIA V5.5 0 – before *
Siemens SIMOTION SCOUT TIA V5.6 0 – before V5.6 SP1 HF7
Siemens SIMOTION SCOUT TIA V5.7 0 – before *
Siemens SINAMICS Startdrive V17 0 – before *
Siemens SINAMICS Startdrive V18 0 – before *
Siemens SINAMICS Startdrive V19 0 – before *
Siemens SINAMICS Startdrive V20 0 – before *
Siemens SIRIUS Safety ES V17 (TIA Portal) 0 – before *
Siemens SIRIUS Safety ES V18 (TIA Portal) 0 – before *
Siemens SIRIUS Safety ES V19 (TIA Portal) 0 – before *
Siemens SIRIUS Safety ES V20 (TIA Portal) 0 – before *
Siemens SIRIUS Soft Starter ES V17 (TIA Portal) 0 – before *
Siemens SIRIUS Soft Starter ES V18 (TIA Portal) 0 – before *
Siemens SIRIUS Soft Starter ES V19 (TIA Portal) 0 – before *
Siemens SIRIUS Soft Starter ES V20 (TIA Portal) 0 – before *
Siemens TIA Portal Cloud V17 0 – before *

Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References