CVE-2026-8065
Received Received - Intake

Authentication Bypass in Hitachi Energy RTU500 Firmware Update

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Hitachi Energy

Description
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.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-8065
EUVD
EUVD-2026-88666

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
hitachi_energy rtu500 *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

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Executive Summary

This vulnerability is an authentication bypass in the firmware update endpoint of Hitachi Energy RTU500. It allows an unauthenticated attacker to upload arbitrary firmware by sending a crafted POST request. This could let the attacker change how the device works or disrupt its operations.

Impact Analysis

If exploited, this vulnerability could let an attacker take control of the RTU500 device, modify its functions, or cause it to stop working. This could disrupt critical operations relying on the device, such as industrial control systems.

Compliance Impact

This vulnerability could lead to unauthorized firmware modifications, potentially compromising device integrity and availability. Such breaches may violate compliance requirements for data protection and operational integrity in standards like GDPR and HIPAA, depending on the device's role in processing or storing sensitive data.

Mitigation Strategies

Immediately restrict network access to the RTU500 firmware update endpoint. Apply the latest firmware update from Hitachi Energy to patch the authentication bypass. Monitor device logs for unauthorized POST requests to the firmware update endpoint.

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