Improper authentication vulnerability in UDR-JA1604/UDR-JA1608/UDR-JA1616 firmware versions 71x10.1.107112.43A and earlier allows a remote authenticated attacker to execute an arbitrary OS command on the device or alter the device settings.
https://jvn.jp/en/vu/JVNVU94514762/index.html
http://www.unimo.co.jp/table_notice/index.php?act=1&resid=1666831567-004418