CVE-2023-32735: Siemens SIMATIC Step 7

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC STEP 7 Safety V16 (All versions < V16 Update 7), SIMATIC STEP 7 Safety V17 (All versions < V17 Update 7), SIMATIC STEP 7 Safety V18 (All versions < V18 Update 2), SIMATIC STEP 7 V16 (All versions < V16 Update 7), SIMATIC STEP 7 V17 (All versions < V17 Update 7), SIMATIC STEP 7 V18 (All versions < V18 Update 2), SIMATIC WinCC Unified V16 (All versions < V16 Update 7), SIMATIC WinCC Unified V17 (All versions < V17 Update 7), SIMATIC WinCC Unified V18 (All versions < V18 Update 2), SIMATIC WinCC V16 (All versions < V16.7), SIMATIC WinCC V17 (All versions < V17.7), SIMATIC WinCC V18 (All versions < V18 Update 2), SIMOCODE ES V16 (All versions < V16 Update 7), SIMOCODE ES V17 (All versions < V17 Update 7), SIMOCODE ES V18 (All versions < V18 Update 2), SIMOTION SCOUT TIA V5.4 SP1 (All versions), SIMOTION SCOUT TIA V5.4 SP3 (All versions), SIMOTION SCOUT TIA V5.5 SP1 (All versions), SINAMICS Startdrive V16 (All versions), SINAMICS Startdrive V17 (All versions), SINAMICS Startdrive V18 (All versions), SIRIUS Safety ES V17 (All versions < V17 Update 7), SIRIUS Safety ES V18 (All versions < V18 Update 2), SIRIUS Soft Starter ES V17 (All versions < V17 Update 7), SIRIUS Soft Starter ES V18 (All versions < V18 Update 2), Soft Starter ES V16 (All versions < V16 Update 7), TIA Portal Cloud V3.0 (All versions < V18 Update 2). Affected applications do not properly restrict the .NET BinaryFormatter when deserializing hardware configuration profiles. This could allow an attacker to cause a type confusion and execute arbitrary code within the affected application. This is the same issue that exists for .NET BinaryFormatter https://docs.microsoft.com/en-us/visualstudio/code-quality/ca2300.

Affected products

Siemens SIMATIC Step 7: before v16update7 (fixed in v16update7); before v17update7 (fixed in v17update7); before v18update2 (fixed in v18update2)
Siemens SIMATIC Step 7 Safety: before v16update7 (fixed in v16update7); before v17update7 (fixed in v17update7); before v18update2 (fixed in v18update2)
Siemens SIMATIC Step 7 Safety v16: before V16 Update 7 (fixed in V16 Update 7)
Siemens SIMATIC Step 7 Safety v17: before V17 Update 7 (fixed in V17 Update 7)
Siemens SIMATIC Step 7 Safety v18: before V18 Update 2 (fixed in V18 Update 2)
Siemens SIMATIC Step 7 v16: before V16 Update 7 (fixed in V16 Update 7)
Siemens SIMATIC Step 7 v17: before V17 Update 7 (fixed in V17 Update 7)
Siemens SIMATIC Step 7 v18: before V18 Update 2 (fixed in V18 Update 2)
Siemens SIMATIC Wincc: before v17.7 (fixed in v17.7); before v18update2 (fixed in v18update2)
Siemens SIMATIC Wincc Unified: before v16update7 (fixed in v16update7); before v17update7 (fixed in v17update7); before v18update2 (fixed in v18update2)
Siemens SIMATIC Wincc Unified v16: before V16 Update 7 (fixed in V16 Update 7)
Siemens SIMATIC Wincc Unified v17: before V17 Update 7 (fixed in V17 Update 7)
Siemens SIMATIC Wincc Unified v18: before V18 Update 2 (fixed in V18 Update 2)
Siemens SIMATIC Wincc v16: before V16.7 (fixed in V16.7)
Siemens SIMATIC Wincc v17: before V17.7 (fixed in V17.7)
Siemens SIMATIC Wincc v18: before V18 Update 2 (fixed in V18 Update 2)
Siemens Simocode Es: before v16update7 (fixed in v16update7); before v17update7 (fixed in v17update7); before v18update2 (fixed in v18update2)
Siemens Simocode Es v16: before V16 Update 7 (fixed in V16 Update 7)
Siemens Simocode Es v17: before V17 Update 7 (fixed in V17 Update 7)
Siemens Simocode Es v18: before V18 Update 2 (fixed in V18 Update 2)
Siemens Simotion Scout Tia: version v5.4sp1 only; version v5.4sp3 only; version v5.5sp1 only
Siemens Simotion Scout Tia v5.4 SP1: any version
Siemens Simotion Scout Tia v5.4 SP3: any version
Siemens Simotion Scout Tia v5.5 SP1: any version
Siemens Sinamics Startdrive: version v17 only; version v18 only
and 12 more

Published 2024-07-09. Last modified 2026-06-17.