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.ubuntulinux.org/support/documentation/usn/usn-210-1 http://www.vuxml.org/freebsd/ae9fb0d7-c4dc-11da-b2fb-000e0c2e438a.html

The following package is affected: netpbm CVE-2005-2978 pnmtopng in netpbm before 10.25, when using the -trans option, uses uninitialized size and index variables when converting Portable Anymap (PNM) images to Portable Network Graphics (PNG), which might allow attackers to execute arbitrary code by modifying the stack.