Cleartext transmission of sensitive information exists in SkyBridge MB-A100/110 firmware Ver. 4.2.0 and earlier. If the telnet connection is enabled, a remote unauthenticated attacker may eavesdrop on or alter the administrator's communication to the product.
https://www.seiko-sol.co.jp/products/skyspider/skyspider_download/mb-r210/
https://www.seiko-sol.co.jp/products/skybridge/skybridge_download/mb-a200/
https://www.seiko-sol.co.jp/products/skybridge/skybridge_download/mb-a130/
https://www.seiko-sol.co.jp/products/skybridge/skybridge_download/mb-a100/