The remote host is missing an update to the system as announced in the referenced advisory.
The following packages are affected: libxml libxml2
CVE-2011-1944 Integer overflow in xpath.c in libxml2 2.6.x through 2.6.32 and 2.7.x through 2.7.8, and libxml 1.8.16 and earlier, allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted XML file that triggers a heap-based buffer overflow when adding a new namespace node, related to handling of XPath expressions.
Solution: Update your system with the appropriate patches or software upgrades.