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1. EXECUTIVE SUMMARY
- CVSS v4 7.1
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Hitachi Energy
- Equipment: Relion 670/650 and SAM600-IO series
- Vulnerability: Improper Check for Unusual or Exceptional Conditions
2. RISK EVALUATION
An authenticated user with file access privilege via FTP access can cause the Relion 670/650 and SAM600-IO series device to reboot due to improper disk space management.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Hitachi Energy reports that the following products are affected:
- Hitachi Energy Relion 650: version 1.0.0 up to and not including 2.0.0
- Hitachi Energy Relion 650: version 2.1.0 up to 2.2.0
- Hitachi Energy Relion 650: version 2.2.0 up to 2.2.0.13
- Hitachi Energy Relion 650: version 2.2.1.0 up to and including 2.2.1.8
- Hitachi Energy Relion 650: version 2.2.4.0 up to and including 2.2.4.5
- Hitachi Energy Relion 650: version 2.2.5.0 up to and including 2.2.5.7
- Hitachi Energy Relion 650: version 2.2.6.0 up to and including 2.2.6.3
- Hitachi Energy Relion 670: version 1.0.0 up to 2.0.0
- Hitachi Energy Relion 670: version 2.0.0 up to 2.1.0
- Hitachi Energy Relion 670: version 2.1.0 up to 2.2.0
- Hitachi Energy Relion 670: version 2.2.0 up to and including 2.2.0.13
- Hitachi Energy Relion 670: version 2.2.1.0 up to and including 2.2.1.8
- Hitachi Energy Relion 670: version 2.2.2.0 up to and including 2.2.2.6
- Hitachi Energy Relion 670: version 2.2.3.0 up to and including 2.2.3.7
- Hitachi Energy Relion 670: version 2.2.4.0 up to and including 2.2.4.5
- Hitachi Energy Relion 670: version 2.2.5.0 up to and including 2.2.5.7
- Hitachi Energy Relion 670: version 2.2.6.0 up to and including 2.2.6.3
- Hitachi Energy SAM600-IO: version 2.2.1.0 up to and including 2.2.1.6
- Hitachi Energy SAM600-IO: version 2.2.5.0 up to and including 2.2.5.7
3.2 VULNERABILITY OVERVIEW
An authenticated user with file access privilege via FTP access can cause the Relion 670/650 and SAM600-IO series device to reboot due to improper disk space management.
CVE-2025-1718 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
A CVSS v4 score has also been calculated for CVE-2025-1718. A base score of 7.1 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).
3.3 BACKGROUND
- CRITICAL INFRASTRUCTURE SECTORS: Energy
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Switzerland
3.4 RESEARCHER
Hitachi Energy PSIRT reported this vulnerability to CISA.
4. MITIGATIONS
Hitachi Energy has identified the following specific workarounds and mitigations users can apply to reduce risk:
- Relion 670 series version 2.2.6 revisions up to 2.2.6.3, Relion 650 series version 2.2.6 revisions up to 2.2.6.3: Update to version 2.2.6.4 (when available) or latest
- Relion 670 series version 2.2.5 revisions up to 2.2.5.7, Relion 650 series version 2.2.5 revisions up to 2.2.5.7, SAM600-IO series version 2.2.5 revisions up to 2.2.5.7: Update to version 2.2.5.8 or latest
- Relion 670 series version 2.2.6 revisions up to 2.2.6.3, Relion 650 series version 2.2.6 revisions up to 2.2.6.3, Relion 670 series version 2.2.5 revisions up to 2.2.5.7, Relion 650 series version 2.2.5 revisions up to 2.2.5.7, SAM600-IO series version 2.2.5 revisions up to 2.2.5.7: Upgrade to version 2.2.7
- All affected products: Apply general mitigation factors
For more information see the associated Hitachi Energy PSIRT security advisory 8DBD000174 Cybersecurity Advisory - Reboot Vulnerability in Hitachi Energy Relion 670/650 and SAM600-IO series products.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:
- Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
- Locate control system networks and remote devices behind firewalls and isolating them from business networks.
- When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.
5. UPDATE HISTORY
- July 03, 2025: Initial Republication of Hitachi Energy Advisory 8DBD000174