Resource exhaustion in Hitachi Energy Relion 670/650 And Sam600-Io

CVE-2025-2403

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-2403: held from 0.003 to 0.004.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-2403?
CVE-2025-2403 is a high-severity vulnerability in Hitachi Energy Relion 670/650 And Sam600-Io, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2025-06-24.
How severe is CVE-2025-2403?
High severity. CVSS v3 base score is 7.5 out of 10.