The remote host is missing an update to drupal announced via advisory DSA 745-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20745-1

Two input validation errors were discovered in drupal and its bundled xmlrpc module. These errors can lead to the execution of arbitrary commands on the web server running drupal. drupal was not included in the old stable distribution (woody). For the current stable distribution (sarge), these problems have been fixed in version 4.5.3-3. For the unstable distribution (sid), these problems have been fixed in version 4.5.4-1. We recommend that you upgrade your drupal package.