CVE-2023-6711: Hitachienergy RTU500 Firmware

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Vulnerability exists in SCI IEC 60870-5-104 and HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below. Specially crafted messages sent to the mentioned components are not validated properly and can result in buffer overflow and as final consequence to a reboot of an RTU500 CMU.

Affected products

• Hitachienergy RTU500 Firmware: from 12.0.1.0, before 12.0.15.0 (fixed in 12.0.15.0); from 12.2.1.0, before 12.2.12.0 (fixed in 12.2.12.0); from 12.4.1.0, before 12.4.12.0 (fixed in 12.4.12.0); from 12.6.1.0, before 12.6.10.0 (fixed in 12.6.10.0); from 12.7.1.0, before 12.7.7.0 (fixed in 12.7.7.0); from 13.2.1.0, before 13.2.7.0 (fixed in 13.2.7.0); …

Published 2023-12-19. Last modified 2026-06-17.