The remote host is missing an update to vlc announced via advisory DSA 2159-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202159-1

Dan Rosenberg discovered that insufficient input validation in VLC's processing of Matroska/WebM containers could lead to the execution of arbitrary code. For the stable distribution (squeeze), this problem has been fixed in version 1.1.3-1squeeze3. The version of vlc in the oldstable distribution (lenny) is affected by further issues and will be addressed in a followup DSA. For the unstable distribution (sid), this problem has been fixed in version 1.1.7-1. We recommend that you upgrade your vlc packages.