CVE-2026-8479
Deferred Deferred - Pending Action
NULL Pointer Dereference in RTU500 via IEC 60870-5-104

Publication date: 2026-05-26

Last updated on: 2026-05-26

Assigner: Hitachi Energy

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.
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Meta Information
Published
2026-05-26
Last Modified
2026-05-26
Generated
2026-06-15
AI Q&A
2026-05-26
EPSS Evaluated
2026-06-14
NVD
CVE-2026-8479
EUVD
EUVD-2026-31814
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
hitachi_energy iec_60870-5-104 *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability affects the IEC 60870-5-104 protocol when it is used in bidirectional mode (BCI). It involves a NULL pointer dereferencing issue that can be triggered by sending a specially crafted sequence of messages over a certain period of time.

The result of this vulnerability is a Denial of Service (DoS) condition, meaning the affected system or service can become unavailable or stop functioning properly.

The product is only vulnerable if the IEC 60870-5-104 functionality is configured in bidirectional mode.

Impact Analysis

The primary impact of this vulnerability is Denial of Service (DoS). An attacker who sends a specially crafted sequence of messages can cause the affected system to crash or become unresponsive.

This can disrupt normal operations, potentially causing downtime or loss of availability of critical services that rely on the IEC 60870-5-104 protocol in bidirectional mode.

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