Tenda AC21 formSetMacFilterCfg function buffer overflow vulnerability

Tenda AC21 is a wireless router from Tenda, China. Tenda AC21 V16.03.08.15 is vulnerable to a buffer overflow vulnerability, which is caused by the formSetMacFilterCfg function that does not perform a length-size check on the input data, and can be exploited to cause a denial of service.