CVE-2004-2597: Id Software Quake Ii Server

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

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.

Affected products

• Id Software Quake Ii Server: version 3.20 only; version 3.21 only

Published 2004-12-31. Last modified 2026-06-16.