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The CVE-2025-55222 vulnerability exists in the Modbus TCP and Modbus RTU over TCP USB Function functionality of Socomec DIRIS Digiware M-70 firmware version 1.6.9. An attacker can trigger a denial of service by sending a specially crafted network packet to port 503, which handles Modbus RTU over TCP communications. The malicious packet exploits a flaw in the device’s packet processing logic, causing it to become unresponsive or crash. This attack is unauthenticated, requiring no prior credentials, allowing any network-adjacent actor to exploit it. The crafted packet likely contains malformed Modbus data that the device fails to parse correctly, leading to resource exhaustion or a buffer overflow condition. Specifically, the vulnerability affects the USB Function feature, which may involve improper error handling when interpreting Modbus RTU over TCP messages. By sending this packet, the attacker disrupts the normal operation of the Digiware M-70, impacting its energy monitoring capabilities. The device may require a manual reboot to recover, causing operational downtime. This vulnerability highlights the risks associated with industrial protocols like Modbus, which often lack built-in security mechanisms. Exploitation necessitates network access to port 503, making exposed devices particularly vulnerable. The issue was discovered through security research and reported to the vendor for remediation. Patches are expected to address the improper input validation in the affected functionality.
Platform: Socomec DIRIS Digiware
Version: 1.6.9
Vulnerability: Denial of Service
Severity: Critical
Date: 12/01/2025
Prediction: Patch Expected 01/31/2026
What Undercode Say:
Analytics:
Bash command to test TCP connectivity to Modbus port:
`nc -zv
503`</h2>
Example Python script to send a basic Modbus RTU over TCP frame:
[bash]
import socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(('[bash]', 503))
sock.send(b'\x00\x01\x00\x00\x00\x06\x01\x03\x00\x00\x00\x01')
sock.close()
Use tools like `mbap` or `modbus-cli` for protocol analysis.
How Exploit:
Send crafted Modbus RTU over TCP packet to port 503 causing device crash.
Protection from this CVE:
Apply vendor patch, restrict network access, use firewalls.
Impact:
Operational downtime, disrupted energy monitoring.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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