No major Modern Warfare 3 update goes without regression. As of writing, the community has identified two bugs:

Behind the scenes, the patch reinforces the active game servers against network manipulation. Client-side authentication checks have been tightened to prevent modified configurations from accessing public matchmaking queues.

: The "Mark of the Survivor" animated camo, previously locked behind a difficult Zombies mode challenge (Unstable Rift), was unexpectedly granted for free to all players.

While major rebalancing has moved to newer titles like , this update resolves specific legacy bugs within MW3: