CVE-2026-8479
Medium
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.
SeverityMedium
CVSS6.9
Exploit probability—
ProductRTU500 series CMU firmware
PublishedMay 26, 2026
First seenMay 26, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Hitachi Energy RTU500 series CMU firmware | 12.7.1 ≤ v ≤ 12.7.7, 13.5.1 ≤ v ≤ 13.5.4, 13.6.1 ≤ v ≤ 13.6.3, 13.7.1 ≤ v ≤ 13.7.8, 13.8.1 | — |
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