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Some vendors remain unreachable even after a number of reasonable good faith attempts to reach them. And by them—and by reasonable we mean considerably less than exhausting the entire list above. Some vendors just do not seem to want to be reached. That , and that is their prerogative. We However, we have found that experience is often the best teacher. When a vendor gets surprised by the publication of a vulnerability in their product and it is clear from the report that attempts to notify them were made but failed, it can prompt the vendor to re-evaluate their vulnerability intake and handling processes to make it easier to reach them in the future.

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