CVE-2026-8479 PUBLISHED

Assigner: Hitachi Energy
Reserved: 13.05.2026 Published: 26.05.2026 Updated: 26.05.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Hitachi Energy
Product	RTU500 series CMU firmware
Versions	Default: unaffected affected from 12.7.1 to 12.7.7 (incl.) affected from 13.5.1 to 13.5.4 (incl.) affected from 13.6.1 to 13.6.3 (incl.) affected from 13.7.1 to 13.7.8 (incl.) Version 13.8.1 is affected

References

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

Problem Types

CWE-476 NULL pointer dereference CWE