The remote host is missing an update to eldav announced via advisory DSA 325-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20325-1

eldav, a WebDAV client for Emacs, creates temporary files without taking appropriate security precautions. This vulnerability could be exploited by a local user to create or overwrite files with the privileges of the user running emacs and eldav. For the stable distribution (woody) this problem has been fixed in version 0.0.20020411-1woody1. The old stable distribution (potato) does not contain an eldav package. For the unstable distribution (sid) this problem has been fixed in version 0.7.2-1. We recommend that you update your eldav package.