The remote host is missing an update to ktorrent announced via advisory DSA 1372-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201372-1

It was discovered that ktorrent, a BitTorrent client for KDE, was vulnerable to a directory traversal bug which potentially allowed remote users to overwrite arbitrary files. For the stable distribution (etch), this problem has been fixed in version 2.0.3+dfsg1-2etch1. For the old stable distribution (sarge), this package was not present. For the unstable distribution (sid), this problem was fixed in version 2.2.1.dfsg.1-1. We recommend that you upgrade your ktorrent package.