The remote host is missing an update to libvorbis announced via advisory DSA 1591-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201591-1

Several local (remote) vulnerabilities have been discovered in libvorbis, a library for the Vorbis general-purpose compressed audio codec. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2008-1419 libvorbis does not properly handle a zero value which allows remote attackers to cause a denial of service (crash or infinite loop) or trigger an integer overflow. CVE-2008-1420 Integer overflow in libvorbis allows remote attackers to execute arbitrary code via a crafted OGG file, which triggers a heap overflow. CVE-2008-1423 Integer overflow in libvorbis allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted OGG file which triggers a heap overflow. For the stable distribution (etch), these problems have been fixed in version 1.1.2.dfsg-1.4. For the unstable distribution (sid), these problems have been fixed in version 1.2.0.dfsg-3.1. We recommend that you upgrade your libvorbis package.