admin.cgi in Active Classifieds Free Edition 1.0, and possibly commercial versions, allows remote attackers to modify the configuration, gain privileges, and execute arbitrary Perl code via the table_width parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6754
http://www.securityfocus.com/bid/2942
http://archives.neohapsis.com/archives/bugtraq/2001-06/0386.html