The remote host is missing an update to the system as announced in the referenced advisory.
Update your system with the appropriate patches or software upgrades. http://www.claws-mail.org/news.php http://www.vuxml.org/freebsd/c389d06d-ee57-11db-bd51-0016179b2dd5.html
The following package is affected: claws-mail =====
CVSS Base Score: 2.6