CVE-2023-32735

Code execution via unrestricted hardware-profile deserialization

Published Jul 9, 2024 · Updated Aug 27, 2025

Unsafe deserialization in Siemens engineering platforms allows local users to execute arbitrary code through a crafted hardware profile. The applications pass user-controlled profile data to .NET BinaryFormatter without restricting permitted types, enabling type confusion during object reconstruction. Exploitation requires high privileges and user interaction to open an untrusted file; execution remains within the affected application's context.

CVSS severity7.0
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Siemens engineering platforms allows local users to execute arbitrary code through a crafted hardware profile. The applications pass user-controlled profile data to .NET BinaryFormatter without restricting permitted types, enabling type confusion during object reconstruction. Exploitation requires high privileges and user interaction to open an untrusted file; execution remains within the affected application's context.

The record

CVE
CVE-2023-32735
Published
Jul 9, 2024
Updated
Aug 27, 2025
Vendor
Siemens
Product
SIMATIC STEP 7
Classifications
CWE-502, T1203, T1204.002
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <v16update7
  2. Affected versionversion=0 <V16 Update 7
  3. Affected versionversion=0 <v17update7
  4. Affected versionversion=0 <V17 Update 7
  5. Affected versionversion=0 <v18update2
  6. Affected versionversion=0 <V18 Update 2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Siemens · SIMATIC STEP 7version=0 <v16update7; version=0 <V16 Update 7; version=0 <v17update7; version=0 <V17 Update 7; version=0 <v18update2; version=0 <V18 Update 2
Siemens · SIMATIC WinCCversion=0 <V16.7; version=0 <v17.7; version=0 <V17.7; version=0 <v18update2; version=0 <V18 Update 2
Siemens · SIRIUS Safety ESversion=0 <v17update7; version=0 <V17 Update 7; version=0 <v18update2; version=0 <V18 Update 2
Siemens · TIA Portal Cloudversion=0 <v18update2; version=0 <V18 Update 2
Siemens · SIMOCODE ESversion=0 <v16update7; version=0 <V16 Update 7; version=0 <v17update7; version=0 <V17 Update 7; version=0 <v18update2; version=0 <V18 Update 2
Siemens · SIMATIC STEP 7 Safetyversion=0 <v16update7; version=0 <V16 Update 7; version=0 <v17update7; version=0 <V17 Update 7; version=0 <v18update2; version=0 <V18 Update 2
Siemens · SIMATIC WinCC Unifiedversion=0 <v16update7; version=0 <V16 Update 7; version=0 <v17update7; version=0 <V17 Update 7; version=0 <v18update2; version=0 <V18 Update 2
Siemens · SIRIUS Soft Starter ESversion=0 <v16update7; version=0 <V16 Update 7; version=0 <v17update7; version=0 <V17 Update 7; version=0 <v18update2; version=0 <V18 Update 2
Siemens · SIMOTION SCOUT TIAversion=0 <*; version=v5.4sp1; version=v5.4sp3; version=v5.5sp1
Siemens · SINAMICS Startdriveversion=0 <*; version=v17; version=v18

Published CVSS scores

6.5Siemens AGCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
7.0Siemens AGCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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