Internet explorer bug or Micromedia Flash bug ?

[cyber_hunter <cyber_hunter () LINUXBR COM BR>]

Hello ,
I have found in my ie5 a vulnerability , I don't know if someone has already
found it , but  ...  , ok let's go
My computer was updated with  Flash 3 plugin , and I tryed to open a site
builded with flash 5 , and then :

This program has performed an illegal operation ...

click in Details >> SWflash.ocx

Ok , maybe this is a problem in my computer ,
so I tryed in others and the same answer .
Maybe this could be a buffer overflow , I don't know ...
I have not tryed with others browsers.