CVE-2023-32735

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-09 · updated 2026-06-17
Weakness: CWE-502

Description

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 (TIA Portal): before v16update7; before v17update7; before v18update2 — fixed in v16update7, v17update7, v18update2
Siemens Simatic Step 7 Safety: before v16update7; before v17update7; before v18update2 — fixed in v16update7, v17update7, v18update2
Siemens Simatic Wincc: before v17.7; before v18update2 — fixed in v17.7, v18update2
Siemens Simatic Wincc Unified: before v16update7; before v17update7; before v18update2 — fixed in v16update7, v17update7, v18update2
Siemens Simocode Es: before v16update7; before v17update7; before v18update2 — fixed in v16update7, v17update7, v18update2
Siemens Simotion Scout Tia: v5.4sp1, v5.4sp3, v5.5sp1
Siemens SINAMICS Startdrive: v17, v18
Siemens Sirius Safety Es: before v17update7; before v18update2 — fixed in v17update7, v18update2
Siemens Sirius Soft Starter Es: before v17update7; before v18update2 — fixed in v17update7, v18update2
Siemens Soft Starter Es: before v16update7 — fixed in v16update7
Siemens TIA Portal Cloud V3.0: before v18update2 — fixed in v18update2

How to fix

Upgrade to a fixed version: Siemens SIMATIC STEP 7 (TIA Portal) v16update7, v17update7, v18update2; Siemens Simatic Step 7 Safety v16update7, v17update7, v18update2; Siemens Simatic Wincc v17.7, v18update2; Siemens Simatic Wincc Unified v16update7, v17update7, v18update2; Siemens Simocode Es v16update7, v17update7, v18update2; Siemens Sirius Safety Es v17update7, v18update2; Siemens Sirius Soft Starter Es v17update7, v18update2; Siemens Soft Starter Es v16update7; Siemens TIA Portal Cloud V3.0 v18update2. Check the vendor advisory for mitigations.

References

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