PRO-Search 0.17 and earlier allows remote attackers to cause a denial of service via certain values of the show_page and time parameters to the default URI.
http://www.securityfocus.com/archive/1/485786/100/0/threaded
http://websecurity.com.ua/1259/
http://sourceforge.net/project/shownotes.php?release_id=563784&group_id=149797