Description
RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Hitachi Energy | RTU500 series CMU firmware | 12.7.1 – ≤ 12.7.7, 13.5.1 – ≤ 13.5.4, 13.6.1 – ≤ 13.6.3, 13.7.1 – ≤ 13.7.8, 13.8.1 – ≤ 13.8.2 | — |
Advisories 2
- ICSA-26-293-05 Hitachi Energy RTU500 Product CISA ICS & IT advisories · Oct 20, 2026
- WID-SEC-2026-3167 Hitachi Energy RTU500: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 2, 2026