CVE-2026-8479 MEDIUM

CVE-2026-8479

Vendor Hitachi Energy
Product RTU500 series CMU firmware
Weakness CWE-476
Published May 26, 2026
Last update May 26, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Adjacent
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 26, 2026 CVE published
May 26, 2026 Record updated