CVE-2021-40334: Hitachienergy FOX615 Firmware

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

Missing Handler vulnerability in the proprietary management protocol (port TCP 5558) of Hitachi Energy FOX61x, XCM20 allows an attacker that exploits the vulnerability by activating SSH on port TCP 5558 to cause disruption to the NMS and NE communication. This issue affects: Hitachi Energy FOX61x versions prior to R15A. Hitachi Energy XCM20 versions prior to R15A.

Affected products

• Hitachienergy FOX615 Firmware: before r15a (fixed in r15a)
• Hitachienergy XCM20 Firmware: before r15a (fixed in r15a)

Published 2021-12-02. Last modified 2026-06-17.