# CVE-2026-8067: Hitachi Energy RTU500 firmware update authentication bypass

Source: https://junglewise.ai/threats/cve-2026-8065-an-authentication-bypass-vulnerability-in-the-firmware-update  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-29. Updated: 2026-09-29  
License: CC BY 4.0 with a link back

CVE-2026-8067 · Severity: critical · CVSS 9.1 · Published 2026-09-29

Hitachi Energy RTU500 is a remote terminal unit used to control and monitor electrical grid infrastructure. An unauthenticated attacker can upload malicious firmware to affected devices by sending a crafted request to the firmware update endpoint, bypassing authentication controls. Successful exploitation allows an attacker to take complete control of the device, disrupting power distribution, disabling protections, or causing widespread outages.

Technologies: [Hitachi Energy RTU500](https://junglewise.ai/threats/technologies/rtu500). Vendors: [Hitachi Energy](https://junglewise.ai/threats/vendors/hitachi-energy).

## Quick answers

**Is CVE-2026-8067 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-8067 being exploited in the wild.

**How severe is CVE-2026-8067?** Critical severity, with a CVSS score of 9.1, published 29 September 2026.

**Which products and versions are affected?** Hitachi Energy RTU500.

**Is there a fix for CVE-2026-8067?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-8067 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-8067?** Check whether you run Hitachi Energy RTU500. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an authentication bypass in the firmware update endpoint (CVE-2026-8065, CVSS 9.1) affecting Hitachi Energy RTU500. An unauthenticated attacker can craft a POST request to upload arbitrary firmware without valid credentials, requiring only network access to the device. Successful exploitation grants full device compromise and code execution, allowing modification of device functionality or disruption of critical infrastructure operations.

## Affected products

- Hitachi Energy RTU500

## Identifiers

- CVE-2026-8067
- CVE-2010-2965
- CVE-2026-8065
- CVE-2023-46143
- CVE-2014-9195
- CVE-2026-8066

## Timeline

- 2026-09-29: disclosed

## References

- [https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch](https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch)

## Related threats

- [Hitachi Energy RTU500 improper authorization in web application](https://junglewise.ai/threats/cve-2026-8067-an-improper-authorization-vulnerability-in-the-rtu500-s-web)
- [Hitachi Energy RTU500 directory traversal in file upload](https://junglewise.ai/threats/cve-2026-8066-a-directory-traversal-vulnerability-in-the-file-upload)
- [Hitachi Energy RTU500 NULL pointer dereference in IEC 104 messaging](https://junglewise.ai/threats/cve-2026-17539-hitachi-energy-rtu500-null-pointer-dereference-in-iec-104)