CVE-1999-0526

An X server's access control is disabled (e.g. through an "xhost +" command) and allows anyone to connect to the server.

CVE-2007-1003

Integer overflow in ALLOCATE_LOCAL in the ProcXCMiscGetXIDList function in the XC-MISC extension in the X.Org X11 server (xserver) 7.1-1.1.0, and other versions before 20070403, allows remote authenticated users to execute arbitrary code via a large expression, which results in memory corruption.