Autodesk has released a hotfix to fix a potential security vulnerability in the live update mechanism. This affects AutoCAD 2004-AutoCAD 2009-based products (verticals included).
To see the readme and download the hot fix and see the complete list of affected programs, please visit the Autodesk website here.
or copy/paste the following link into your internet browser.
http://usa.autodesk.com/getdoc/id=DL12452198