Quake II server before R1Q2, as used in multiple products, allows remote attackers to bypass IP-based access control rules via a userinfo string that already contains an "ip" key/value pair but is also long enough to cause a new key/value pair to be truncated, which interferes with the server's ability to find the client's IP address.

Quake II server before R1Q2, as used in multiple products, allows remote attackers to cause a denial of service (application crash) via a modified client that asks the server to send data stored at a negative array offset, which is not handled when processing Configstrings and Baselines.

Quake II server before R1Q2, as used in multiple products, allows remote attackers to cause a denial of service (exhaustion of connection slots) via a large number of connections from the same IP address.

Buffer overflow in command-packet processing of Quake II server before R1Q2, as used in multiple products, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a packet with a long cmd_args buffer.

Absolute path traversal vulnerability in Quake II server before R1Q2 on Windows, as used in multiple products, allows remote attackers to read arbitrary files via a "\/" in a pathname argument, as demonstrated by "download \/server.cfg".

Absolute path traversal vulnerability in Quake II server before R1Q2 on Linux, as used in multiple products, allows remote attackers to cause a denial of service (application crash) via a download command with a full pathname for a directory in the argument, which causes the server to crash when it cannot read data.