The remote host is missing an update to pavuk announced via advisory DSA 527-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20527-1

Ulf Härnhammar discovered a vulnerability in pavuk, a file retrieval program, whereby an oversized HTTP 305 response sent by a malicious server could cause arbitrary code to be executed with the privileges of the pavuk process. For the current stable distribution (woody), this problem has been fixed in version 0.9pl28-1woody1. pavuk is no longer included in the unstable distribution of Debian. We recommend that you update your pavuk package.