Every program is potentially exploutable. The only defense is defense in depth, where an intrustion attempt fails at layer 3 of 5, alarms bells ring, and those

Every program is potentially exploutable. The only defense is defense in depth, where an intrustion attempt fails at layer 3 of 5, alarms bells ring, and those 3 compromised layers get hardening upgrades. What usually happens is that layers 1 and 2 of 3 are constantly compromised, no one cares to follow up, and one day layer 3 gets compromised, shock of shocks.