{"uuid": "1456bf2b-8990-46d5-baba-46238d830071", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-59375", "type": "seen", "source": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-155-02", "content": "View CSAF\n\nSummary\n\nHitachi Energy is aware of vulnerabilities that affect ITT600 Explorer product versions listed in this document. These vulnerabilities can be exploited to carry out Denial of Service (DoS) attack on the product. The vulnerabilities only affect Hitachi Energy Integrated Testing Tool ITT600 SA Explorer without affecting IEC 61850 system endpoints. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation.\n\nThe following versions of Hitachi Energy ITT600 Explorer are affected:\n\n\n\nITT600 Explorer vers:ITT600_Explorer/<2.1_SP6, vers:ITT600_Explorer/<=2.1_SP6, 2.1_SP6 (CVE-2024-8176, CVE-2025-59375)\n\n<div class=\"csaf-table\">\n\n\n\n\nCVSS\nVendor\nEquipment\nVulnerabilities\n\n\n\n\nv3 7.5\nHitachi Energy\nHitachi Energy ITT600 Explorer\nUncontrolled Recursion, Allocation of Resources Without Limits or Throttling\n\n\n\n</div>\n\nBackground\n\n\n\nCritical Infrastructure Sectors: Energy\n\nCountries/Areas Deployed: Worldwide\n\nCompany Headquarters Location: Switzerland\n\n\n\n\nVulnerabilities\n<div class=\"csaf-accordion\">\n\nExpand All +\n<div class=\"csaf-accordion-item\">\n\nCVE-2024-8176\n<div class=\"csaf-accordion-content\">\n\nA stack overflow vulnerability exists in the libexpat library used by the IEC61850 functionality supported by the product. A malicious user with local access could use a crafted IEC61850 message to exploit the vulnerability in the libexpat library. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage. Product is only affected if IEC61850 server simulation is used.\n\nView CVE Details\n\n\n\nAffected Products\n\nHitachi Energy ITT600 Explorer\n<div class=\"ics-vendor-version-status\">\n<div class=\"ics-vendor\">Vendor:Hitachi Energy</div>\n<div class=\"ics-version\">Product Version:ITT600 Explorer before version 2.1 SP6</div>\n<div class=\"ics-status\">Product Status:fixed, known_affected</div>\n</div>\n<div class=\"ics-remediations\">\n\nRemediations\n\nVendor fixUpdate to version 2.1 SP6 HF1\n\nVendor fixUpgrade to version 2.2 when available\n</div>\n\nRelevant CWE: CWE-674 Uncontrolled Recursion\n\n\n\nMetrics\n<div class=\"csaf-table csaf-metrics-table\">\n\n\n\n\nCVSS Version\nBase Score\nBase Severity\nVector String\n\n\n\n\n3.1\n7.5\nHIGH\nCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\n\n\n\n</div>\n</div>\n</div>\n<div class=\"csaf-accordion-item\">\n\nCVE-2025-59375\n<div class=\"csaf-accordion-content\">\n\nA vulnerability exists in libexpat used by the product allowing attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing. Product is only affected if IEC61850 server simulation is used.\n\nView CVE Details\n\n\n\nAffected Products\n\nHitachi Energy ITT600 Explorer\n<div class=\"ics-vendor-version-status\">\n<div class=\"ics-vendor\">Vendor:Hitachi Energy</div>\n<div class=\"ics-version\">Product Version:ITT600 Explorer version 2.1 SP6 and prior</div>\n<div class=\"ics-status\">Product Status:known_affected</div>\n</div>\n<div class=\"ics-remediations\">\n\nRemediations\n\nVendor fixUpdate to version 2.1 SP6 HF1\n\nVendor fixUpgrade to version 2.2 when available\n</div>\n\nRelevant CWE: CWE-770 Allocation of Resources Without Limits or Throttling\n\n\n\nMetrics\n<div class=\"csaf-table csaf-metrics-table\">\n\n\n\n\nCVSS Version\nBase Score\nBase Severity\nVector String\n\n\n\n\n3.1\n7.5\nHIGH\nCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\n\n\n\n</div>\n</div>\n</div>\n</div>\n\n\n\nAcknowledgments\n\n\n\nHitachi Energy Internal Team reported this vulnerability to CISA. \n\n\n\n\nNotice\n\nThe information in this document is subject to change without notice and should not be construed as a commitment by Hitachi Energy. Hitachi Energy provides no warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, for the information contained in this document, and assumes no responsibility for any errors that may appear in this document. In no event shall Hitachi Energy or any of its suppliers be liable for direct, indirect, special, incidental or consequential damages of any nature or kind arising from the use of this document, or from the use of any hardware or software described in this document, even if Hitachi Energy or its suppliers have been advised of the possibility of such damages. This document and parts hereof must not be reproduced or copied without written permission from Hitachi Energy and the contents hereof must not be imparted to a third party nor used for any unauthorized purpose. All rights to registrations and trademarks reside with their respective owners.\n\n\n\nSupport\n\nFor additional information and support please contact your product provider or Hitachi Energy service organization. For contact information, see https://www.hitachienergy.com/contact-us/ for Hitachi Energy contact-centers.\n\n\n\nGeneral Mitigation Factors\n\nRecommended security practices and firewall configurations can help protect a process control network from attacks that originate from outside the network. Such practices include 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. Additional information on Industrial Control Systems Cybersecurity Best Practices can be found in the following Hitachi Energy Cybersecurity Notification. Cybersecurity Advisory - Industrial Control Systems Cybersecurity Best Practices\n\n\n\nSSVC\n\nSSVCv2/E:N/A:Y/2026-05-26T08:58:04Z/\n\n\n\nLegal Notice and Terms of Use\n\nThis product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).\n\n\n\nRecommended Practices\n\nCISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability.\n\nMinimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.\n\nLocate control system networks and remote devices behind firewalls and isolate them from business networks.\n\nWhen remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices.\n\nCISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\n\nCISA 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.\n\nCISA 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.\n\nOrganizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.\n\n\n\nAdvisory Conversion Disclaimer\n\nThis ICSA is a verbatim republication of Hitachi Energy PSIRT 8DBD000241 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided \"as-is\" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Hitachi Energy PSIRT directly for any questions regarding this advisory.\n\nRevision History\n\n\n\nInitial Release Date: 2026-05-26\n\n\n\n\n\nDate\nRevision\nSummary\n\n\n\n\n2026-05-26\n1\nInitial public release\n\n\n2026-06-04\n2\nInitial CISA Republication of Hitachi Energy PSIRT 8DBD000241 advisory\n\n\n\n\n\n\nLegal Notice and Terms of Use", "creation_timestamp": "2026-06-04T10:00:00.000000Z"}