CVE-2026-8479

MEDIUM

Hitachi Energy RTU500 Series Cmu Firmware - NULL Pointer Dereference

Title source: rule

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.

References (1)

Core 1

Core References

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

Scores

CVSS v4 6.9

EPSS 0.0016

EPSS Percentile 6.0%

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-476

Status published

Products (5)

Hitachi Energy/RTU500 series CMU firmware 12.7.1 - 12.7.7

Hitachi Energy/RTU500 series CMU firmware 13.5.1 - 13.5.4

Hitachi Energy/RTU500 series CMU firmware 13.6.1 - 13.6.3

Hitachi Energy/RTU500 series CMU firmware 13.7.1 - 13.7.8

Hitachi Energy/RTU500 series CMU firmware 13.8.1

Published May 26, 2026

Tracked Since May 26, 2026