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Siemens SIMATIC S7-1500 TM MFP

Monitor7.8ICS-CERT ICSA-25-072-03Mar 11, 2025
Attack VectorLocal
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

Multiple vulnerabilities exist in the BIOS of the SIMATIC S7-1500 TM MFP, including memory corruption flaws (CWE-125, CWE-415, CWE-416), use-after-free errors, null pointer dereferences, integer overflows, and race conditions that could be exploited by a local user to compromise system integrity or cause denial of service. Siemens is preparing fix versions and recommends protecting network access and following Industrial Security operational guidelines until patches are available.

What this means
What could happen
BIOS-level vulnerabilities in the S7-1500 TM MFP could allow a local attacker with user privileges to corrupt memory, bypass security controls, or cause the device to stop responding, potentially disrupting automation logic and process control.
Who's at risk
This affects manufacturers and operators of automated systems using the Siemens SIMATIC S7-1500 TM MFP controller in water treatment, electric utility, chemical processing, and discrete manufacturing environments. Primarily of concern to facilities with engineering workstations or maintenance staff requiring local access to reprogram or maintain the controller.
How it could be exploited
An attacker with local access (logged-in user account) to the S7-1500 TM MFP could exploit memory corruption or logic flaws in the BIOS to execute arbitrary code or manipulate the system at firmware level, affecting the integrity and availability of the programmable logic controller.
Prerequisites
  • Local user account on the S7-1500 TM MFP
  • Physical or direct network access (not remotely exploitable)
  • Siemens reports fix versions in preparation but no patch available yet
no patch availablelocal privilege escalationaffects safety-critical control systemsmemory corruption vulnerabilitiesBIOS-level access
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
HARDENINGRestrict local user access to the S7-1500 TM MFP engineering workstations only; enforce strong authentication and account management controls.
HARDENINGSegment the S7-1500 TM MFP on a dedicated network with firewall rules limiting access to authorized engineering stations and HMI systems only.
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXMonitor Siemens security advisories for BIOS fix versions and apply them in a planned maintenance window as soon as available.
Mitigations - no patch available
0/1
SIMATIC S7-1500 TM MFP - BIOS has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGFollow Siemens' operational guidelines for Industrial Security and product manual recommendations for secure device configuration.
View full CISA ICS-CERT advisory
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