Original Article Summary

View CSAF Summary Hitachi Energy is aware of Dirty Frag vulnerabilities that affect APM Edge product versions listed in this document. Successful exploitation of these vulnerabilities could result in impact on confidentiality, integrity and availability of the product. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation. The following versions of Hitachi Energy APM Edge Product are affected: APM Edge vers:APM_Edge/<=6.10 (CVE-2026-43284, CVE-2026-43500) CVSS Vendor Equipment Vulnerabilities v3 8.8 Hitachi Energy Hitachi Energy APM Edge Product Write-what-where Condition, Out-of-bounds Write Background Critical Infrastructure Sectors: Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Switzerland Vulnerabilities Expand All + CVE-2026-43284 CWE-123: Write-what-where Condition A vulnerability exists in the IPsec ESP subsystem (esp4, esp6) of the Linux kernel used in APM Edge that allows a local unprivileged user to escalate privileges to root. The flaw exists in how the kernel handles memory pages when processing ESP encrypted network packets. An attacker can craft a packet that causes the kernel to decrypt data directly into memory pages it does not own, including the cached copies of privileged operating system binaries. When one of those binaries is executed, the attacker's injected code runs with root privileges. In APM Edge, the vulnerable kernel modules (esp4, esp6) can be loaded by any local user and exploited. View CVE Details Affected Products Hitachi Energy APM Edge Product Vendor: Hitachi Energy Product Version: APM Edge versions 6.10 and prior Product Status: known_affected Remediations Mitigation Disable the esp4 and esp6 modules [2] Relevant CWE: CWE-123 Write-what-where Condition Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVE-2026-43500 CWE-787: Out-of-bounds Write A vulnerability exists in the RxRPC protocol implementation of Linux kernel used in APM Edge that allows a local unprivileged user to escalate privileges to root. RxRPC incorrectly processes incoming network packets that carry externally owned memory fragments. During packet processing, the kernel writes decrypted data directly into memory pages it does not own, including cached copies of privileged operating system binaries. Upon execution of a corrupted binary, the attacker's injected code runs with root privileges. In APM Edge, the vulnerable kernel module (rxrpc) can be loaded by any local user and exploited. View CVE Details Affected Products Hitachi Energy APM Edge Product Vendor: Hitachi Energy Product Version: APM Edge versions 6.10 and prior Product Status: known_affected Remediations Mitigation Disable the rxrpc module [2] Relevant CWE: CWE-787 Out-of-bounds Write Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Acknowledgments Hitachi Energy Internal Team reported these vulnerabilities to CISA Notice The 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. Support For 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. General Mitigation Factors Recommended 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 Hitachi Energy “Industrial Control Systems Cybersecurity Best Practices” Cybersecurity Notification. [1] SSVC SSVCv2/E:N/A:N/2026-07-24T07:30:06Z/ Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When 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. 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. Advisory Conversion Disclaimer This ICSA is a verbatim republication of Hitachi Energy PSIRT 8DBD000256 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. Revision History Initial Release Date: 2026-07-28 Date Revision Summary 2026-07-28 1 Initial public release 2026-08-13 2 Initial CISA Republication of Hitachi Energy PSIRT 8DBD000256 advisory Legal Notice and Terms of Use