The remote host is missing an update to cadaver announced via advisory DSA 507-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20507-1

Stefan Esser discovered a problem in neon, an HTTP and WebDAV client library, which is also present in cadaver, a command-line client for WebDAV server. User input is copied into variables not large enough for all cases. This can lead to an overflow of a static heap variable. For the stable distribution (woody) this problem has been fixed in version 0.18.0-1woody3. For the unstable distribution (sid) this problem has been fixed in version 0.22.1-3. We recommend that you upgrade your cadaver package.