static CURLcode smtp_state_servergreet_resp(struct connectdata *conn,
                                            int smtpcode,
                                            smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;

  (void)instate; /* no use for this yet */

  if(smtpcode/100 != 2) {
    failf(data, "Got unexpected smtp-server response: %d", smtpcode);
    result = CURLE_WEIRD_SERVER_REPLY;
  }
  else
    result = smtp_perform_ehlo(conn);

  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.