An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01 AC9 V1.0 V15.03.05.19(6318)_CN AC9 V3.0 V15.03.06.42_multi AC15 V1.0 V15.03.05.19_multi_TD01 and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/SetNetControlList list parameter for a POST request a value is directly used in a strcpy to a local variable placed on the stack which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.