The remote host is missing an update to xzgv announced via advisory DSA 614-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20614-1

Luke infamous41md discoverd multiple vulnerabilities in xzgv, a picture viewer for X11 with a thumbnail-based selector. Remote exploitation of an integer overflow vulnerability could allow the execution of arbitrary code. For the stable distribution (woody) these problems have been fixed in version 0.7-6woody2. For the unstable distribution (sid) these problems have been fixed in version 0.8-3. We recommend that you upgrade your xzgv package immediately.