The remote host is missing an update as announced via advisory SSA:2007-305-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2007-305-01

CUPS was found to contain errors in ipp.c which could allow a remote attacker to crash CUPS, resulting in a denial of service. If you use CUPS, it is recommended to update to the latest package for your version of Slackware. The latest cups package is available for Slackware -current, and patched packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, 10.2, 11.0, and 12.0 that fix the problems. More details about this issue may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4351