Resource allocation without limits in Hitachi Energy Relion 670/650 and SAM600-IO
Priority MEDIUM 44CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0037 31st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Hitachi Energy | Relion 670/650 and SAM600-IO | 2.2.6.0 – 2.2.6.2; 2.2.5.6; 2.2.4.4; 2.2.3.7; 2.2.2.6 | — | No fix listed | CNA |
- Relion 670/650 and SAM600-IO VendorHitachi Energy Affected 2.2.6.0 – 2.2.6.2; 2.2.5.6; 2.2.4.4; 2.2.3.7; 2.2.2.6 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-2403
- 2026-10-03 Alias added: GHSA-h6m2-5c7m-x9f8
References
More Hitachi Energy vulnerabilities
- TI-2019-03985 ABB MicroSCADA Pro SYS600 Missing Authentication for Critical Function CVSS 3.1CRITICAL 9.8
- TI-2018-10635 Improper authentication in ICS-CERT ABB eSOMS CVSS 3.0CRITICAL 9.8
- TI-2024-01871 Heap-based buffer overflow in Hitachi Energy FOXMAN-UN CVSS 3.1CRITICAL 9.8
- TI-2026-07105 Path traversal in Hitachi Energy RTU500 series CMU firmware CVSS 3.1CRITICAL 9.1
- TI-2019-13270 Path traversal in Relion 670 Series CVSS 3.1CRITICAL 10.0
- TI-2026-07104 Missing authentication in Hitachi Energy RTU500 series CMU firmware CVSS 3.1CRITICAL 9.1
Sources
- CVE-2025-2403 · CVE Program
- CVE-2025-2403 · NVD
- FIRST EPSS
- GHSA-h6m2-5c7m-x9f8 · GitHub Advisory Database · CC BY 4.0
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