Drupal sites have suffered Denial Of Service attacks when an attacker repeatedly ran the site's cron.php from the URL address line. It would be worth checking for this vulnerability and recommending the simple .htacces restriction described here: http://drupal.org/node/41049#comment-122705
Comments
Comment #1
coltraneI think this would be eligible for #906726: Recommendations system
Comment #2
DrewMathers CreditAttribution: DrewMathers commented#906726-2: Recommendations system