Description
A vulnerability exists in RTU IEC 61850 client and server functionality that could impact the availability if renegotiation of an open IEC61850 TLS connection takes place in specific timing situations, when IEC61850 communication is active.
Precondition is that IEC61850 as client or server are configured using TLS on RTU500 device. It affects the CMU the IEC61850 stack is configured on.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Hitachi Energy | RTU500 | 13.7.1 – ≤ 13.7.4 | 13.7.6 |
Advisories 2
- ICSA-25-093-01 Hitachi Energy RTU500 Series (Update B) CISA ICS & IT advisories · Sep 9, 2025
- WID-SEC-2025-0637 Hitachi Energy RTU500: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Mar 25, 2025