ICSA-26-279-06
Vulnerability from csaf_cisa - Published: 2026-09-29 00:00 - Updated: 2026-10-06 06:00Summary
Hitachi Energy RTU500
Severity
Critical
Notes
Summary: 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 Since the end-of-life versions are no longer maintained with security updates, Hitachi Energy strongly recommends upgrading to a currently supported RTU500 firmware version.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.
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]
Critical infrastructure sectors: Energy
Countries/areas deployed: Worldwide
Company headquarters location: Switzerland
SSVC: SSVCv2/E:N/A:N/2026-09-28T14:38:32Z/
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).
Advisory Conversion Disclaimer: This ICSA is a verbatim republication of Hitachi Energy PSIRT 8DBD000251 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.
Recommended Practices: CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability.
Recommended Practices: Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.
Recommended Practices: Locate control system networks and remote devices behind firewalls and isolate them from business networks.
Recommended Practices: 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.
Recommended Practices: CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Recommended Practices: 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.
Recommended Practices: 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.
Recommended Practices: Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
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.
9.1 (Critical)
Affected products
Known affected
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
RTU500 series CMU Firmware versions 11.x and prior (End-of-Life)
Hitachi Energy / RTU500 series CMU Firmware
|
vers:RTU500_series_CMU_Firmware/<=11.x |
Vendor Fix
|
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.
9.1 (Critical)
Affected products
Known affected
1 product, the same list as for
CVE-2026-8065
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.
6.5 (Medium)
Affected products
Known affected
1 product, the same list as for
CVE-2026-8065
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.
9.8 (Critical)
Affected products
Known affected
1 product, the same list as for
CVE-2026-8065
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.
8.1 (High)
Affected products
Known affected
1 product, the same list as for
CVE-2026-8065
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.
7.5 (High)
Affected products
Known affected
1 product, the same list as for
CVE-2026-8065
References
32 references
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"notes": [
{
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},
"products": [
"CSAFPID-0001"
]
}
],
"title": "CVE-2010-2965"
},
{
"cve": "CVE-2014-9195",
"cwe": {
"id": "CWE-306",
"name": "Missing Authentication for Critical Function"
},
"notes": [
{
"category": "description",
"text": "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."
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "NVD - CVE-2014-9195",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2014-9195"
},
{
"category": "external",
"summary": "www.cve.org",
"url": "https://www.cve.org/CVERecord?id=CVE-2014-9195"
},
{
"category": "external",
"summary": "cwe.mitre.org",
"url": "https://cwe.mitre.org/data/definitions/306.html"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "Upgrade to version 12.7.8 or 13.9.1 or latest",
"product_ids": [
"CSAFPID-0001"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
"CSAFPID-0001"
]
}
],
"title": "CVE-2014-9195"
},
{
"cve": "CVE-2023-46143",
"cwe": {
"id": "CWE-494",
"name": "Download of Code Without Integrity Check"
},
"notes": [
{
"category": "description",
"text": "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."
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "NVD - CVE-2023-46143",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46143"
},
{
"category": "external",
"summary": "www.cve.org",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-46143"
},
{
"category": "external",
"summary": "cwe.mitre.org",
"url": "https://cwe.mitre.org/data/definitions/494.html"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "Upgrade to version 12.7.8 or 13.9.1 or latest",
"product_ids": [
"CSAFPID-0001"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"CSAFPID-0001"
]
}
],
"title": "CVE-2023-46143"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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