CVE-2025-2403: Hitachi Energy Relion 670/650 And SAM600-Io

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A denial-of-service vulnerability due to improper prioritization of network traffic over protection mechanism exists in Relion 670/650 and SAM600-IO series device that if exploited could potentially cause critical functions like LDCM (Line Distance Communication Module) to malfunction.

Affected products

• Hitachi Energy Relion 670/650 And SAM600-Io: from 2.2.6.0, up to and including 2.2.6.2; version 2.2.5.6 only; version 2.2.4.4 only; version 2.2.3.7 only; version 2.2.2.6 only

Published 2025-06-24. Last modified 2026-06-17.