CVE-2026-8479

State: Published
Severity: 6.9 Medium
Published: May 26, 2026
Updated: May 26, 2026
Reserved: May 13, 2026

Description

IEC 60870-5-104 used in bidirectional mode in RTU500 is vulnerable for a NULL pointer dereferencing, if a specially crafted sequence of messages is sent for a certain time, causing Denial of Service impact. Product is only affected if IEC 60870-5-104 functionality in bidirectional mode (BCI) is configured.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	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 13.8.1Affected

References

https://publisher.hitachienergy.com/preview?DocumentID=8DBD000252&LanguageCode=en&DocumentPartId=&Action=Launch

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