The remote CentOS host is missing one or more security updates.
Updated CUPS packages that fix a security issue are now available for Red Hat Enterprise Linux 3, 4, and 5. This update has been rated as having moderate security impact by the Red Hat Security Response Team. The Common UNIX Printing System (CUPS) provides a portable printing layer for UNIX(R) operating systems. A bug was found in the way CUPS handled SSL negotiation. A remote user capable of connecting to the CUPS daemon could cause a denial of service to other CUPS users. (CVE-2007-0720) All users of CUPS should upgrade to these updated packages, which contain a backported patch introducing a timeout, which prevents connections being kept open for an arbitrarily long time.