The remote host is missing an update as announced via advisory SSA:2005-242-02.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2005-242-02

New PHP packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, and -current to fix security issues. PHP has been relinked with the shared PCRE library to fix an overflow issue with PHP's builtin PRCE code, and PEAR::XMLRPC has been upgraded to version 1.4.0 which eliminates the eval() function. The eval() function is believed to be insecure as implemented, and would be difficult to secure. Note that these new packages now require that the PCRE package be installed, so be sure to get the new package from the patches/packages/ directory if you don't already have it. A new version of this (6.3) was also issued today, so be sure that is the one you install.