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8.6HIGH

CVE-2025-55221 — A denial of service vulnerability exists in the Modbus TCP and Modbus RTU over TCP USB Function…

Socomec · Diris M-70 Firmware · Published 1 Dec 2025 · Modified 26 Sept 2026

Description

A denial of service vulnerability exists in the Modbus TCP and Modbus RTU over TCP USB Function functionality of Socomec DIRIS Digiware M-70 1.6.9. A specially crafted network packet can lead to a denial of service. An attacker can send an unauthenticated packet to trigger this vulnerability.This vulnerability is specific to the malicious message sent via Modbus TCP over port 502.

References

What to do
  1. Check whether Diris M-70 Firmware is in your asset inventory.
  2. Patch in the next maintenance window; prioritise internet-facing systems.
  3. Record the decision in your risk register for audit evidence.
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Link: adminadda.com/cve/CVE-2025-55221