Security firm Secunia, has released a security advisory on the Unreal Engine used in Unreal Tournament 2004. It seems the Unreal Engine has a very dangerous security vulnerability in it that will allow malicious people to take over your computer. The vulnerability is caused due to a boundary error within the processing of secure queries, which are used to verify that a queried server is a legit Unreal server. This can be exploited to cause a buffer overflow by sending an overly long challenge string to a vulnerable server. Read more..