OTPulse

Siemens SIMATIC S7-1500 TM MFP

MonitorCVSS 7.8ICS-CERT ICSA-25-072-03Mar 11, 2025
Siemens
Attack path
Attack VectorLocal
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

Multiple vulnerabilities exist in the BIOS of the SIMATIC S7-1500 TM MFP module, including out-of-bounds memory access (CWE-125, CWE-805), use-after-free conditions (CWE-416), null pointer dereferences (CWE-476), and uninitialized variables (CWE-457). These defects could allow a local attacker with low privileges to read sensitive memory, corrupt data structures, or cause the module to stop responding. Siemens states it is preparing fixes but has not yet released patches for any version.

What this means
What could happen
Multiple memory corruption and logic errors in the S7-1500 TM MFP BIOS could allow a local attacker with limited privileges to read sensitive memory, corrupt data, or crash the module, potentially disrupting water/power control logic that depends on this module.
Who's at risk
Water and power utilities using SIMATIC S7-1500 TM MFP modules in their programmable logic controllers and industrial automation systems. Any facility relying on these modules for critical process control, including pump stations, electrical substations, or SCADA systems, should prioritize this vulnerability.
How it could be exploited
An attacker with local access and low-privilege credentials on the S7-1500 TM MFP could trigger memory safety bugs through specially crafted BIOS calls or memory access patterns, leading to information disclosure or denial of service without requiring physical hardware tampering or elevated administrator roles.
Prerequisites
  • Local access to the S7-1500 TM MFP (physical or remote shell access)
  • Low-privilege user credentials on the device
  • Ability to execute code or make BIOS calls on the device
No patch currently availableAffects safety-critical control modulesLocal privilege escalation potentialMemory corruption vulnerabilitiesLow EPSS score but high CVSS severity
Exploitability
Unlikely to be exploited — EPSS score 0.0%
Affected products (1)
ProductAffected VersionsFix Status
SIMATIC S7-1500 TM MFP - BIOSAll versionsNo fix (EOL)
Remediation & Mitigation
0/5
Do now
0/3
HARDENINGRestrict network access to S7-1500 TM MFP devices using firewall rules, allowing only authorized engineering workstations and control systems
HARDENINGIsolate S7-1500 TM MFP modules on a dedicated control network segment separate from general IT networks and untrusted systems
HARDENINGImplement strong access controls and disable default or shared credentials on all S7-1500 TM MFP devices
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HARDENINGDisable unnecessary network services and remote access protocols on S7-1500 TM MFP devices
HOTFIXMonitor for Siemens security updates and apply BIOS patches immediately when available
View full CISA ICS-CERT advisory
API: /api/v1/advisories/40a0c91f-ffbf-4d30-989a-6ae43ed27f28

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