Hitachi Energy Relion 670, 650 Series and SAM600-IO Product

Posted on Thursday June 05, 2025

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1. EXECUTIVE SUMMARY

CVSS v3 9.8
ATTENTION: Exploitable remotely/low attack complexity
Vendor: Hitachi Energy
Equipment: Relion 670, Relion 650, SAM600-IO
Vulnerabilities: Integer Overflow or Wraparound

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to cause memory corruption on the products.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Hitachi Energy reports that the following products are affected:

Relion 670/650/SAM600-IO series: Version 2.2.5 revisions up to 2.2.5.1
Relion 670/650 series: Version 2.2.4 revisions up to 2.2.4.2
Relion 670 series: Version 2.2.3 revisions up to 2.2.3.4
Relion 670 series: Version 2.2.2 revisions up to 2.2.2.4
Relion 670/650/SAM600-IO series: Version 2.2.1 revisions up to 2.2.1.7
Relion 670/650 series version 2.2.0: All revisions
Relion 670/650 series version 2.1: All revisions
Relion 670 series version 2.0: All revisions
Relion 670 series version 1.2: All revisions
Relion 670 series version 1.1: All revisions
Relion 650 series version 1.3: All revisions
Relion 650 series version 1.2: All revisions
Relion 650 series version 1.1: All revisions
Relion 650 series version 1.0: All revisions

3.2 VULNERABILITY OVERVIEW

3.2.1 INTEGER OVERFLOW OR WRAPAROUND CWE-190

In Wind River VxWorks, memory allocator has a possible overflow in calculating the memory block's size to be allocated by calloc(). As a result, the actual memory allocated is smaller than the buffer size specified by the arguments, leading to memory corruption.

CVE-2020-28895 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.3 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.2 INTEGER OVERFLOW OR WRAPAROUND CWE-190

An issue was discovered in Wind River VxWorks 7. The memory al-locator has a possible integer overflow in calculating a memory block's size to be allocated by calloc(). As a result, the actual memory allocated is smaller than the buffer size specified by the arguments, leading to memory corruption.

CVE-2020-35198 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Energy
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: Switzerland

3.4 RESEARCHER

Hitachi Energy reported these vulnerabilities to CISA.

4. MITIGATIONS

Hitachi Energy has identified the following specific workarounds and mitigations users may apply to reduce risk:

Relion 670 series version 2.2.5 revisions up to 2.2.5.1, Relion 650 series version 2.2.5 revisions up to 2.2.5.1, SAM-IO series version 2.2.5 revisions up to 2.2.5.1: Update to 2.2.5.2 version or latest
Relion 670 series version 2.2.4 revisions up to 2.2.4.2, Relion 650 series version 2.2.4 revisions up to 2.2.4.2: Update to 2.2.4.3 version or latest
Relion 670 series version 2.2.3 revisions up to 2.2.3.4: Update to 2.2.3.5 version or latest
Relion 670 series version 2.2.2 revisions up to 2.2.2.4: Update to 2.2.2.5 version or latest
Relion 670 series version 2.2.1 revisions up to 2.2.1.7, Relion 650 series version 2.2.1 revisions up to 2.2.1.7, SAM-IO series version 2.2.1 revisions up to 2.2.1.7: Update to 2.2.1.8 version or latest
Relion 670 series version 1.1 to 2.2.0 all revisions, Relion 650 series version 1.0 to 2.2.0 all revisions: Refer to the Mitigation Factors/Workaround Section for the current mitigation strategy.

For more information see the associated Hitachi Energy PSIRT security advisory 8DBD000070 Cybersecurity Advisory - BadAlloc – Memory Allocation Vulnerabilities in Hitachi Energy Relion 670, 650 series and SAM600-IO Product.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, 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:

Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.