Summary
The remote host is missing an update to the system as announced in the referenced advisory.
Solution
Update your system with the appropriate patches or software upgrades.
http://secunia.com/advisories/43020/
http://www.vuxml.org/freebsd/53bde960-356b-11e0-8e81-0022190034c0.html
Insight
The following package is affected: mupdf
