NTT EAST Hikari Denwa routers with firmware PR-400MI, RT-400MI, and RV-440MI 07.00.1006 and earlier and NTT WEST Hikari Denwa routers with firmware PR-400MI, RT-400MI, and RV-440MI 07.00.1005 and earlier allow remote authenticated users to execute arbitrary OS commands via unspecified vectors.
http://www.ntt-west.co.jp/kiki/support/flets/hgw4_mi/160627.html
http://web116.jp/ced/support/news/contents/2016/20160627.html