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Vulnerabilities in the BIOS of the SIMATIC S7-1500 TM MFP

Monitor7.8SSA-503939Mar 11, 2025
Attack VectorLocal
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

Multiple vulnerabilities have been identified in the BIOS of the SIMATIC S7-1500 TM MFP affecting all versions. The vulnerabilities involve buffer over-reads, use-after-free, null pointer dereference, and other memory safety issues (CWE-125, CWE-415, CWE-416, CWE-476, CWE-805, CWE-457, CWE-362, CWE-835, CWE-20). These BIOS-level flaws could allow code execution with elevated privileges when exploited locally by an authenticated user. Siemens is preparing fix versions but has not yet released them.

What this means
What could happen
Vulnerabilities in the BIOS of SIMATIC S7-1500 TM MFP could allow a local attacker with user privileges to execute arbitrary code on the controller, potentially disrupting critical automation processes or altering control logic.
Who's at risk
Water authorities and municipal utilities operating SIMATIC S7-1500 TM MFP programmable logic controllers (PLCs) in critical processes such as pump control, valve operation, water treatment, or power distribution should be aware of these vulnerabilities. This device is commonly used for automation and process control in these environments.
How it could be exploited
An attacker with local access to the S7-1500 TM MFP device and valid user-level credentials could exploit BIOS-level vulnerabilities (buffer overflows, use-after-free, null pointer dereference) to escalate privileges and execute code with system-level access, affecting the device's operation and any connected plant processes.
Prerequisites
  • Local access to the SIMATIC S7-1500 TM MFP device
  • Valid user-level credentials or interactive access to the device console
  • Ability to interact with BIOS or firmware components
BIOS/firmware-level vulnerabilitylocal access required but privilege escalation possibleno patch currently availableaffects critical automation controllershigh CVSS score (7.8)
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (1)
ProductAffected VersionsFix Status
SIMATIC S7-1500 TM MFP - BIOSAll versionsNo fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGConfigure network access controls to restrict who can reach the SIMATIC S7-1500 TM MFP device; implement firewalls and access control lists to limit device accessibility
HARDENINGImplement physical and logical access controls to prevent unauthorized local access to the device console or management interfaces
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HARDENINGFollow Siemens' operational guidelines for Industrial Security to harden the device and its operating environment
HOTFIXMonitor Siemens security advisories for BIOS patch releases for the SIMATIC S7-1500 TM MFP and apply updates as soon as they become available and can be safely integrated into your maintenance schedule
View full Siemens ProductCERT advisory
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API: /api/v1/advisories/19567688-f1d3-479f-bcb5-9b8d279475af