RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00351.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Hitachi Energy RTU500 series CMU firmware unaffected
Version Status Constraints
12.7.1 affected ≤ 12.7.7
13.5.1 affected ≤ 13.5.4
13.6.1 affected ≤ 13.6.3
13.7.1 affected ≤ 13.7.8
13.8.1 affected ≤ 13.8.2

No data.

No data.

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Vendors Products
Hitachienergy Subscribe
Rtu500 Firmware Subscribe

Project Subscriptions

Vendors Products
Hitachienergy Subscribe
Rtu500 Firmware Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://publisher.hitachienergy.com/preview?DocumentID=8DBD000259&LanguageCode=en&DocumentPartId=&Action=Launch cve-icon cve-icon
History

Thu, 03 Sep 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Hitachienergy
Hitachienergy rtu500 Firmware
Vendors & Products Hitachienergy
Hitachienergy rtu500 Firmware

Thu, 03 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 03 Sep 2026 09:30:00 +0000

Type Values Removed Values Added
Title Denial of Service via NULL Pointer Dereference in Hitachi Energy RTU500 IEC 60870-5-104 Communication

Thu, 03 Sep 2026 08:15:00 +0000

Type Values Removed Values Added
Description RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.
Weaknesses CWE-476
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Hitachi Energy

Published:

Updated: 2026-09-03T12:48:06.779Z

Reserved: 2026-07-27T09:46:09.631Z

Link: CVE-2026-17539

cve-icon Vulnrichment

Updated: 2026-09-03T12:48:03.247Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-03T13:04:35.693

Modified: 2026-09-03T16:43:15.293

Link: CVE-2026-17539

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T15:30:05Z

Weaknesses