Vulnerability · Published May 26, 2026 · Assigned by Hitachi Energy
CVE-2026-8479
Medium 6.9
In plain English
A medium-severity null pointer dereference in RTU500 series CMU firmware from Hitachi Energy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.2%top 93.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Hitachi Energy | RTU500 series CMU firmware | 12.7.1 – through 12.7.713.5.1 – through 13.5.413.6.1 – through 13.6.313.7.1 – through 13.7.813.8.1 |
Weakness: CWE-476 · 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