CVE-2026-17539

State: Published
Severity: 5.9 Medium
Published: Sep 3, 2026
Updated: Sep 3, 2026
Reserved: Jul 27, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	Hitachi Energy

Weaknesses

CWE-476 NULL pointer dereference

Affected Products

Product	Versions
RTU500 series CMU firmwareHitachi Energy	12.7.1 through 12.7.7Affected 13.5.1 through 13.5.4Affected 13.6.1 through 13.6.3Affected 13.7.1 through 13.7.8Affected 13.8.1 through 13.8.2Affected

References

https://publisher.hitachienergy.com/preview?DocumentID=8DBD000259&LanguageCode=en&DocumentPartId=&Action=Launch

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