That depends entirely on whether the item was designed to withstand people attacking it.
A bomb shelter is defective if someone drops a bomb on it (at the designed distance and explosive power) and it collapses.
A skyscraper is defective if it was designed to withstand a plane impact and it does not.
A car is defective if it was designed to withstand people trying to hack it, and it doesn't.
A car's design is defective if it was not designed to withstand people trying to hack it.