Summary
The remote host is missing an update to the system as announced in the referenced advisory.
Solution
Update your system with the appropriate patches or software upgrades.
http://www.hardened-php.net/advisory-032005.php
http://www.hardened-php.net/advisory-042005.php
http://www.hardened-php.net/advisory-052005.php
http://marc.theaimsgroup.com/?l=bugtraq&m=111954136315248 http://www.vuxml.org/freebsd/1cf00643-ed8a-11d9-8310-0001020eed82.html
Insight
The following package is affected: cacti