The long awaited Javelin patch is now ready for release on Xbox Live according to Infinity Ward. It is likely to go live over the weekend.
Prior to the patch, online gamers were able to exploit a bug in order to gain an advantage when playing online.
There were plenty of unhappy MW2 gamers online complaining about the error: http://boards.ign.com/call_of_duty/b6860/187287460/p1/
So goodbye to Javelin cheaters!
For those who are unaware of the Javelin glitch see the video explaination below: