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://bugs.debian.org/376824 http://www.vuxml.org/freebsd/9dda3ff1-2b02-11db-a6e2-000e0c2e438a.html

The following package is affected: x11vnc CVE-2006-2450 auth.c in LibVNCServer 0.7.1 allows remote attackers to bypass authentication via a request in which the client specifies an insecure security type such as 'Type 1 - None', which is accepted even if it is not offered by the server, a different issue than CVE-2006-2369.