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CVE-2026-8479

MEDIUM
6.9
CVSS Score
Published: May 26, 2026 at 11:54 AM UTC
Updated: July 23, 2026 at 07:32 PM UTC
1 product affected across 1 vendorRTU500

Using RTU500 series CMU firmware by Hitachi Energy?

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

IEC 60870-5-104 used in bidirectional mode 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

RTU500· Hitachi Energy
60%
12.7.1 ≤ v ≤ 12.7.713.5.1 ≤ v ≤ 13.5.413.6.1 ≤ v ≤ 13.6.313.7.1 ≤ v ≤ 13.7.812.7.113.5.113.6.113.7.113.8.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMHitachi Energy
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-476

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