Quake3 Arena allows malicious server operators to read or modify files on a client via a dot dot (..) attack.

Quake 3 arena 1.29f and 1.29g allows remote attackers to cause a denial of service (crash) via a malformed connection packet that begins with several char-255 characters.

Quake 3 engine, as used in multiple games, allows remote attackers to cause a denial of service (client disconnect) via a long message, which is not properly truncated and causes the engine to process the remaining data as if it were network data.

Buffer overflow in the Quake 3 Engine, as used by (1) ET 2.60, (2) Return to Castle Wolfenstein 1.41, and (3) Quake III Arena 1.32b allows remote attackers to execute arbitrary commands via a long remapShader command.