The remote host is missing an update to the system as announced in the referenced advisory.
The following package is affected: roundcube
CVE-2008-5619 html2text.php in RoundCube Webmail (roundcubemail) 0.2-1.alpha and 0.2-3.beta allows remote attackers to execute arbitrary code via crafted input that is processed by the preg_replace function with the eval switch.
Solution: Update your system with the appropriate patches or software upgrades.