Integer signedness error in the enet_protocol_handle_incoming_commands function in protocol.c for ENet library CVS version Jul 2005 and earlier, as used in products including (1) Cube, (2) Sauerbraten, and (3) Duke3d_w32, allows remote attackers to cause a denial of service (application crash) via a packet with a large command length value, which leads to an invalid memory access.