A security vulnerability has been detected in Totolink CA750-PoE 6.2c.510. Impacted is the function setNetworkDiag of the file /cgi-bin/cstecgi.cgi of the component Setting Handler. The manipulation of the argument NetDiagHost/NetDiagPingNum/NetDiagPingSize/NetDiagPingTimeOut/NetDiagTracertHop is directly passed by the attacker/so we can control the NetDiagHost/NetDiagPingNum/NetDiagPingSize/NetDiagPingTimeOut/NetDiagTracertHop leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.