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.

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Hitachi Energy RTU500 series CMU firmware unaffected
Version Status Constraints
12.7.1 affected ≤ 12.7.7
13.5.1 affected ≤ 13.5.4
13.6.1 affected ≤ 13.6.3
13.7.1 affected ≤ 13.7.8
13.8.1 affected —

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://publisher.hitachienergy.com/preview?DocumentID=8DBD000252&LanguageCode=en&DocumentPartId=&Action=Launch cve-icon cve-icon
History

Tue, 26 May 2026 16:45:00 +0000

Type Values Removed Values Added
Title Null Pointer Dereference in IEC 60870-5-104 Bidirectional Mode Leading to Denial of Service

Tue, 26 May 2026 15:45:00 +0000

Type Values Removed Values Added
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. 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.

Tue, 26 May 2026 13:45:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-476
References
Metrics cvssV4_0

{'score': 6.9, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Hitachi Energy

Published:

Updated: 2026-05-26T14:49:40.036Z

Reserved: 2026-05-13T13:42:53.588Z

Link: CVE-2026-8479

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-26T14:16:41.247

Modified: 2026-05-26T16:16:28.030

Link: CVE-2026-8479

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-26T16:30:10Z

Weaknesses