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.
https://secunia.com/advisories/45416/
http://www.vuxml.org/freebsd/e454ca2f-f88d-11e0-b566-00163e01a509.html
Insight
The following package is affected: pivotx