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Siemens SIMATIC S7-1500 CPUs Vulnerable to Multiple Exploitable Flaws

First seen 23 Oct 2026, 03:13 UTC • •
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ThreatCluster •October 23, 2026 at 04:11 UTC
  • •Multiple vulnerabilities identified in Siemens SIMATIC S7-1500 CPUs.
  • •No patches currently available; Siemens recommends specific mitigations.
  • •Impacts critical sectors including manufacturing and healthcare.

Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of Siemens SIMATIC S7-1500 CPUs, specifically affecting firmware version V3.1.7 and the SIMATIC S7-1500 TM MFP V1.1.1. The affected models include various configurations of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP and the SIMATIC S7-1500 TM MFP. Attack vectors may include unauthorized access to the interactive shell, leading to potential exploitation of sensitive data. Siemens is preparing fixes but currently has no available patches. The vulnerabilities impact critical infrastructure sectors such as manufacturing, transportation, energy, healthcare, and financial services. Specific mitigations include limiting access to trusted personnel and only running applications from trusted sources. The vulnerabilities have been reported to CISA by Siemens ProductCERT.

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Timeline

2026-10-22
Vulnerabilities disclosed
Siemens reported multiple vulnerabilities in the GNU/Linux subsystem of the SIMATIC S7-1500 CPUs and TM MFP.
Cisa
2026-10-22
Mitigations recommended
Siemens advised limiting access to the interactive shell and running applications from trusted sources.
Cisa

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Common questions

Which Siemens models are affected?
The vulnerabilities affect the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP and the SIMATIC S7-1500 TM MFP.
What mitigations should be implemented?
Limit access to the interactive shell to trusted personnel and only run applications from trusted sources.
When will patches be available?
Siemens is preparing fixes, but currently no patches are available.