Schneider Electric Modicon M340, BMXNOE0100, and BMXNOE0110
Monitor6.5ICS-CERT ICSA-25-254-09Jun 11, 2024
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
Vulnerability in Schneider Electric Modicon M340 programmable automation controllers and associated BMXNOE0100/BMXNOE0110 Ethernet network modules. An attacker with network access to FTP port 21/TCP can upload files without authentication if FTP service is enabled. This could prevent firmware updates and cause webserver malfunction. Core automation operations are not directly affected. Modbus/TCP Ethernet modules (BMXNOE0100 and BMXNOE0110) have been patched; remediation for base Modicon M340 is still under development.
What this means
What could happen
An attacker with FTP access to the network could upload unauthorized files to the Modicon M340 controller or Ethernet network modules, potentially affecting device configuration or webserver operation. This could prevent firmware updates and cause the webserver to malfunction, though core process control operations are not directly impacted.
Who's at risk
Energy utilities and infrastructure operators using Schneider Electric Modicon M340 programmable automation controllers (PACs) and their associated BMXNOE0100 or BMXNOE0110 Ethernet network modules. This affects any facility using these controllers for industrial automation, especially generation, transmission, or distribution operations.
How it could be exploited
An attacker on the network sends FTP commands to port 21/TCP on the Modicon M340 or BMXNOE0100/BMXNOE0110 module. If FTP is enabled (not the default), the attacker can upload files without authentication, potentially altering device configuration or webserver files. No user interaction is required.
Prerequisites
- Network access to FTP port 21/TCP on the device
- FTP service must be explicitly enabled (not default)
- No credentials required
remotely exploitableno authentication requiredlow complexityFTP enabled non-default but possibleaffects webserver and firmware update capability
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (3)
2 with fix1 EOL
ProductAffected VersionsFix Status
Modbus/TCP Ethernet Modicon M340 module<SV3.60SV3.60
Modbus/TCP Ethernet Modicon M340 FactoryCast module<SV6.80SV6.80
Modicon M340 All versionsAll versionsNo fix (EOL)
Remediation & Mitigation
0/6
Do now
0/2WORKAROUNDConfigure firewall rules to block all unauthorized access to FTP port 21/TCP on the Modicon M340 and network modules
WORKAROUNDDisable FTP service on the device if it is not actively required for remote management
Schedule — requires maintenance window
0/3Patching may require device reboot — plan for process interruption
Modbus/TCP Ethernet Modicon M340 module
HOTFIXUpdate BMXNOE0100 (Modbus/TCP Ethernet Modicon M340 module) to version SV3.60 or later
Modbus/TCP Ethernet Modicon M340 FactoryCast module
HOTFIXUpdate BMXNOE0110 (Modbus/TCP Ethernet Modicon M340 FactoryCast module) to version SV6.80 or later
All products
HARDENINGConfigure Access Control List (ACL) following Schneider Electric's Modicon M340 Ethernet Communications Modules and Processors User Manual
Mitigations - no patch available
0/1Modicon M340 All versions has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGImplement network segmentation to isolate Modicon M340 controllers from business networks and internet access
CVEs (1)
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