The remote host is missing an update to htmlheadline announced via advisory DSA 622-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20622-1

Javier Fernández-Sanguino Peña has discovered multiple insecure uses of temporary files that could lead to overwriting arbitrary files via a symlink attack. For the stable distribution (woody) these problems have been fixed in version 21.8-3. The unstable distribution (sid) does not contain this package. We recommend that you upgrade your htmlheadline package.