ASUS JAPAN RT-AC87U routers with firmware 3.0.0.4.378.3754 and earlier, RT-AC68U routers with firmware 3.0.0.4.376.3715 and earlier, RT-AC56S routers with firmware 3.0.0.4.376.3715 and earlier, RT-N66U routers with firmware 3.0.0.4.376.3715 and earlier, and RT-N56U routers with firmware 3.0.0.4.376.3715 and earlier allow remote authenticated users to execute arbitrary OS commands via unspecified vectors.