"Games rely on the security of the encryption on the platforms they're played on, therefore; updates to the game through patches will not resolve this problem, unless the security exploit itself is resolved on the platform," said Rob Bowling, Infinity Ward's Community Manager.
Bowling went on to say that Modern Warfare 2 was being hit the hardest, due to its popularity, but that the "number of legitimate players severely outweighs the bad apples." Bowling suggests playing with friends to avoid the problem altogether, but also points out that the issue only concerns "legacy games such as Call of Duty 4 and Modern Warfare 2."