The remote host is missing an update to nd announced via advisory DSA 412-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20412-1

Multiple vulnerabilities were discovered in nd, a command-line WebDAV interface, whereby long strings received from the remote server could overflow fixed-length buffers. This vulnerability could be exploited by a remote attacker in control of a malicious WebDAV server to execute arbitrary code if the server was accessed by a vulnerable version of nd. For the current stable distribution (woody) this problem has been fixed in version 0.5.0-1woody1. For the unstable distribution (sid) this problem has been fixed in version 0.8.2-1. We recommend that you update your nd package.