I'm not sure this is a "real" vulnerability for the LEM. First off, the LEM's web server should not be externally accessible, so you'd need someone to be trying to DoS you from inside your own network.
Second, you can restrict who has access to the LEM GUI under the SERVICES menu in CMC shell:
Image may be NSFW.
Clik here to view.
If only a few machines are allowed to access the web console, it will be very difficult to have enough open sessions to DoS the LEM.
