Tenda W20E router V15.11.0.6 contains a stack overflow in the function formSetPortMapping with post request \'goform/setPortMapping/\'. This vulnerability allows attackers to cause a Denial of Service (DoS) or Remote Code Execution (RCE) via the portMappingServer, portMappingProtocol, portMappingWan, porMappingtInternal, and portMappingExternal parameters.