This bug was signaled to EpicGames EXACTLY the 2th September 2003 (today is the 10th March so over 6 months ago) but at the beginning it was underrated & was taken a bit more seriously only at November.
All the developers of the vulnerable games have been alerted by EpicGames through their internal mailing-list.
About UT & UT2003:
EpicGames refused to release a quick-fix for UnrealTournament & UnrealTournament 2003 so the fix was inserted in the planned patch as they do for graphic bugs & other small problems... the patch has not been released yet & is impossible to know when it will be ready.
Would you like to know more? This also includes a listing of vulnerable games.