The remote host is missing an update to imagemagick announced via advisory DSA 646-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20646-1

Andrei Nigmatulin discovered a buffer overflow in the PSD image-decoding module of ImageMagick, a commonly used image manipulation library. Remote exploition with a carefully crafted image could lead to the execution of arbitrary code. For the stable distribution (woody) this problem has been fixed in version 5.4.4.5-1woody5. For the unstable distribution (sid) this problem has been fixed in version 6.0.6.2-2. We recommend that you upgrade your imagemagick packages.