CVE-2022-2081: Hitachienergy RTU520 Firmware

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability exists in the HCI Modbus TCP function included in the product versions listed above. If the HCI Modbus TCP is enabled and configured, an attacker could exploit the vulnerability by sending a specially crafted message to the RTU500 in a high rate, causing the targeted RTU500 CMU to reboot. The vulnerability is caused by a lack of flood control which eventually if exploited causes an internal stack overflow in the HCI Modbus TCP function.

Affected products

• Hitachienergy RTU520 Firmware: from 12.0.1, up to and including 12.0.13; from 12.2.1, up to and including 12.2.11; from 12.4.1, up to and including 12.4.11; from 12.6.1, up to and including 12.6.7; from 12.7.1, up to and including 12.7.3; from 13.2.1, up to and including 13.2.4; …
• Hitachienergy RTU530 Firmware: from 12.0.1, up to and including 12.0.13; from 12.2.1, up to and including 12.2.11; from 12.4.1, up to and including 12.4.11; from 12.6.1, up to and including 12.6.7; from 12.7.1, up to and including 12.7.3; from 13.2.1, up to and including 13.2.4; …
• Hitachienergy RTU540 Firmware: from 12.0.1, up to and including 12.0.13; from 12.2.1, up to and including 12.2.11; from 12.4.1, up to and including 12.4.11; from 12.6.1, up to and including 12.6.7; from 12.7.1, up to and including 12.7.3; from 13.2.1, up to and including 13.2.4; …
• Hitachienergy RTU560 Firmware: from 12.0.1, up to and including 12.0.13; from 12.2.1, up to and including 12.2.11; from 12.4.1, up to and including 12.4.11; from 12.6.1, up to and including 12.6.7; from 12.7.1, up to and including 12.7.3; from 13.2.1, up to and including 13.2.4; …

Published 2024-01-04. Last modified 2026-06-17.