The remote host is missing an update to libvorbis announced via advisory DSA 1471-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201471-1

Several vulnerabilities were found in the the Vorbis General Audio Compression Codec, which may lead to denial of service or the execution of arbitrary code, if a user is tricked into opening to a malformed Ogg Audio file with an application linked against libvorbis. For the unstable distribution (sid), these problems have been fixed in version 1.2.0.dfsg-1. For the stable distribution (etch), these problems have been fixed in version 1.1.2.dfsg-1.3. For the old stable distribution (sarge), these problems have been fixed in version 1.1.0-2. We recommend that you upgrade your libvorbis packages.