'This method is called from the output object. The output object was
called from a plugin or from the framework. This method should take an
action when a vulnerability is found.'

def vulnerability(self, msg_string, new_line=True, severity=severity.MEDIUM):

    m = Message(VULNERABILITY, self._clean_string(msg_string), new_line)
    m.set_severity(severity)
    self._send_to_observers(m)
