CVE-2023-5768: Hitachienergy RTU520 Firmware

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability exists in the HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below. Incomplete or wrong received APDU frame layout may cause blocking on link layer. Error reason was an endless blocking when reading incoming frames on link layer with wrong length information of APDU or delayed reception of data octets. Only communication link of affected HCI IEC 60870-5-104 is blocked. If attack sequence stops the communication to the previously attacked link gets normal again.

Affected products

• Hitachienergy RTU520 Firmware: from 12.0.1, up to and including 12.0.14; 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 12.6.9; from 12.7.1, up to and including 12.7.6; from 13.2.1, up to and including 13.2.6; …
• Hitachienergy RTU530 Firmware: from 12.0.1, up to and including 12.0.14; 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 12.6.9; from 12.7.1, up to and including 12.7.6; from 13.2.1, up to and including 13.2.6; …
• Hitachienergy RTU540 Firmware: from 12.0.1, up to and including 12.0.14; 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 12.6.9; from 12.7.1, up to and including 12.7.6; from 13.2.1, up to and including 13.2.6; …
• Hitachienergy RTU560 Firmware: from 12.0.1, up to and including 12.0.14; 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 12.6.9; from 12.7.1, up to and including 12.7.6; from 13.2.1, up to and including 13.2.6; …

Published 2023-12-04. Last modified 2026-06-17.