A vulnerability was found in Hitachi Energy RTU500 CMU up to 12.7.7/13.5.4/13.6.3/13.7.8/13.8.1 . It has been rated as problematic . This affects an unknown function of the component Bidirectional Mode . This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2026-8479 . The attack needs to be done within the local network. There is no exploit available.