A [security update] for IDL and ENVI license servers was released today by Harris Geospatial Solutions:

>The security vulnerability is limited to computers running a license manager server and should not be an issue when the license server components are only exposed on a trusted network.

If you run an outside facing IDL or ENVI license server, it sounds like you need to update immediately.

[security update]: http://www.harrisgeospatial.com/Company/PressRoom/Blogs/IDLDataPointDetail/TabId/902/ArtMID/2926/ArticleID/14795/IDL--ENVI-License-Server-Security-Patch.aspx "IDL & ENVI License Server Security Patch"