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Hitachi Energy RTU500

CRITICAL
CVSS 9.8
Date 2026-10-06T06:00:00+00:00
Source cisa-csaf
Published by CISA

// Description

Hitachi Energy is publishing this cybersecurity advisory in response to the security findings reported by Dragos affecting end-of-life RTU500 CMU firmware version 9.x. The reported findings are associated with legacy RTU500 firmware versions that were developed according to the cybersecurity requirements, threat landscape, and industry practices that existed at the time of their release. As cybersecurity threats and security expectations have evolved, these end-of-life versions no longer incorporate many of the security controls and hardening measures that are standard in modern industrial control systems. Over successive RTU500 releases, Hitachi Energy has continuously enhanced the security of the product through the introduction of additional security features, protocol hardening, stronger authentication and access controls, encrypted communications, and other security-by-design improvements. While the findings reported by Dragos do not affect currently supported RTU500 CMU firmware versions, there is a likelihood that the end-of-life versions 11.x and prior are affected by these vulnerabilities. Since the end-of-life versions are no longer maintained with security updates, Hitachi Energy strongly recommends upgrading to a currently supported RTU500 firmware version. Customers should also implement appropriate defense-in-depth measures and cybersecurity best practices to reduce risk and strengthen the security posture of their operational environments. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation.

// Vulnerabilities (6)

CVE ID CVSS Score Severity Description
CVE-2023-46143 7.5 high
CVE-2023-46143. A download of code without integrity check vulnerability in Hitachi Energy RTU500 allows an unauthenticated remote attacker to modify some or all applications running on the device. Successful exploitation could result in unauthorized modification of device functionality or disruption of its intended operation.
CVE-2014-9195 8.1 high
CVE-2014-9195. Missing authentication vulnerability in a network service of Hitachi Energy RTU500 allows an unauthenticated remote attacker to execute arbitrary commands using protocol-compliant network traffic. Successful exploitation could result in unauthorized modification of the device or disruption of its intended operation.
CVE-2026-8067 6.5 medium
CVE-2026-8067. An improper authorization vulnerability in the RTU500’s web application allows an authenticated user to trigger the RTU500 to reboot through the reset endpoint. Successful exploitation could cause temporary device unavailability and disruption of its intended operation.
CVE-2026-8066 9.1 critical
CVE-2026-8066. A directory traversal vulnerability in the file upload functionality of Hitachi Energy RTU500 allows an unauthenticated attacker to write or overwrite arbitrary files on the device file system. Depending on the files affected, successful exploitation could result in unauthorized modification of device data or disruption of the device’s intended operation.
CVE-2010-2965 9.8 critical
CVE-2010-2965. The WDB target agent debug service in Wind River VxWorks 6.x, 5.x, and earlier, as used on few of the Hitachi Energy RTU500 CMU firmware legacy versions, allows remote attackers to read or modify arbitrary memory locations, perform function calls, or manage tasks via requests to UDP port 17185.
CVE-2026-8065 9.1 critical
CVE-2026-8065. An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500 allows an unauthenticated attacker to upload arbitrary firmware through a crafted POST request. Successful exploitation could allow the attacker to modify device functionality or compromise the integrity or availability of the device.

// Affected Products (1)

Vendor Product Asset Type Purdue Level Firmware
Hitachi Energy Unknown rtu
L1
12.2

// Remediations (2)

Patch: Upgrade to version 12.7.8 or 13.9.1 or latest
Upgrade to version 12.7.8 or 13.9.1 or latest
Mitigation: Phoenix Contact Software designed the applications and protocols without authentication mechanisms.
Phoenix Contact Software designed the applications and protocols without authentication mechanisms. It is the understanding of Phoenix Contact Software that vendors using the application software and its protocol would incorporate its own authentication mechanism in its final product. Phoenix Contact Software is considering adding authentication software into future versions of its application software and its protocol.

// References