Unreal Tournament 3 1.3beta4 and earlier allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a UDP packet in which the value of a certain size field is greater than the total packet length, aka attack 2 in ut3mendo.c.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.