Buffer overflow in in the copy_msg_element function for the devDiscoverHandle server in the TP-Link WR and WDR series including WDR7400 WDR7500 WDR7660 WDR7800 WDR8400 WDR8500 WDR8600 WDR8620 WDR8640 WDR8660 WR880N WR886N WR890N WR890N WR882N and WR708N.