CVE-2026-17539

Denial of Service via NULL Pointer Dereference in Hitachi Energy RTU500 IEC 60870-5-104 Communication

Published Sep 3, 2026 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Hitachienergy
Hitachienergy rtu500 Firmware
Vendors & Products Hitachienergy
Hitachienergy rtu500 Firmware
Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
Hitachi Energy
Published
Updated
Sep 3, 2026, 12:48 PM
Reserved
Jul 27, 2026, 9:46 AM
Status
Awaiting Analysis
Published
Sep 3, 2026, 1:04 PM
Modified
Sep 3, 2026, 4:43 PM