Hitachi Energy MACH GWS

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1. EXECUTIVE SUMMARY CVSS v4 7.1 ATTENTION: Exploitable remotely/low attack complexity Vendor: Hitachi Energy Equipment: MACH GWS Vulnerabilities: Incorrect Default Permissions, Improper Validation of Integrity Check Value, Improper Certificate Validation
2. RISK EVALUATION Exploiting these vulnerabilities could allow an attacker to tamper with system files, cause a denial of service, or perform a remote man-in-the-middle attack.
3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of MACH GWS affected: MACH GWS: Versions 3.0.0.0 to 3.4.0.0 3.2 VULNERABILITY OVERVIEW 3.2.1 INCORRECT DEFAULT PERMISSIONS CWE-276 A vulnerability exists in MACH GWS product, which if exploited, could allow a local unauthenticated attacker to tamper a system file resulting in a denial of notify service. CVE-2025-39201 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.1 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H). A CVSS v4 score has also been calculated for CVE-2025-39201. A base score of 6.9 has been calculated; the CVSS vector string is (AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:L). 3.2.2 IMPROPER VALIDATION OF INTEGRITY CHECK VALUE CWE-354 A vulnerability exists in the IEC 61850 of the MACH GWS product where an IEC 61850-8 crafted message content from IED or remote system can cause a denial of service resulting in disconnection loop. CVE-2025-39203 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.5 has been calculated; the CVSS vector string is (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-2025-39203. A base score of 7.1 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N). 3.2.3 IMPROPER CERTIFICATE VALIDATION CWE-295 A vulnerability exists in the IEC 61850 in MACH GWS product where the certificate validation of the TLS protocol allows a remote man-in-the-middle attack due to missing proper validation. CVE-2025-39205 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N). A CVSS v4 score has also been calculated for CVE-2025-39205. A base score of 7.1 has been calculated; the CVSS vector string is (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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 these vulnerabilities to CISA.
4. MITIGATIONS Hitachi Energy recommends users update to Version 3.5 at the earliest. Hitachi Energy recommends the following security practices and firewall configurations to help protect a process control network from attacks that originate from outside the network. Such practices include ensuring that process control systems are physically protected from direct access by unauthorized personnel, have no direct connections to the Internet, and are separated from other networks by means of a firewall system that has a minimal number of ports exposed, and others that have to be evaluated case by case. Process control systems should not be used for Internet surfing, instant messaging, or receiving e-mails. Portable computers and removable storage media should be carefully scanned for viruses before they are connected to a control system. Proper password policies and processes should be followed. Hitachi Energy recommends users deploy the product following the “GWS deployment guideline” document. Users should maintain their systems with products running on supported versions and follow maintenance releases. For more information see the associated Hitachi Energy PSIRT security advisory 8DBD000222 Multiple Vulnerabilities in Hitachi Energy MACH GWS Product. 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/ics. 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/ics 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.
5. UPDATE HISTORY October 16, 2025: Initial Republication of Hitachi Energy PSIRT 8DBD000222