|Informative Information for the Uninformed
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Through the use of certain messages in the Battle.net protocol, it is possible to enter a channel beyond the normal 40 user limit. This was due to the fact that the method a game client would use to return to a chat channel after leaving a game would not properly check the user count. After miscreants exploited this vulnerability to put thousands of users into one channel, which subsequently lead to server crashes, Blizzard finally fixed this vulnerability.