This is exactly why Dick Cheney's pacemaker was removed.

Possibly if your testing against medical instrumentation software and literally find a fatal flaw that would indeed kill someone if executed in such a manner as to kill the patient.

Other medical instruments have been shown to be flawed enough by hackers that an immediate software update was called for but these have been very rare. The FDA requires extreme in-depth testing of all medical software before release. On the good side, it keeps us safe. On the negative side, it very much slows down much-needed security and functionality updates from the field.

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