Summary
The remote host is missing an update as announced
via advisory SSA:2007-255-03.
Solution
https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2007-255-03
Insight
New PHP5 packages are available for Slackware 10.1, 10.2, 11.0, and 12.0 to fix 'several low priority security bugs.'
Note that PHP5 was not officially supported in Slackware 10.1 or 10.2 (being in the /testing directory), and was not the default version of PHP for Slackware 11.0 (being in the /extra directory), but updates are being provided anyway.