static CURLcode smtp_perform_rcpt_to(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp = data->req.protop;

  /* Send the RCPT TO command */
  if(smtp->rcpt->data[0] == '<')
    result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:%s",
                           smtp->rcpt->data);
  else
    result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:<%s>",
                           smtp->rcpt->data);
  if(!result)
    state(conn, SMTP_RCPT);

  return result;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.