Description
IEC 60870-5-104 used in RTU500: Potential Denial of Service impact on reception of invalid U-format frame. Product is only affected if IEC 60870-5-104 bi-directional functionality is configured. Enabling secure communication following IEC 62351-3 does not remediate the vulnerability but mitigates the risk of exploitation.
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 – ≤ 13.6.2, 13.7.1 – ≤ 13.7.7, 13.8.1 | — |
Advisories 2
- ICSA-26-062-03 Hitachi Energy RTU500 Product (Update A) CISA ICS & IT advisories · Oct 20, 2026
- WID-SEC-2026-0503 Hitachi Energy RTU500: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 24, 2026