Zero-day vulnerabilities: following the trailblazers
In the world of IT, many vendors publish software sprinkled with bugs and potential security holes. It is very difficult (some would argue next to impossible) and extremely costly to create totally bug- and vulnerability-free software. So software vendors usually aim for a balance between acceptable quality versus cost. Of course that means some software contains bugs and vulnerabilities just waiting to be uncovered. In the majority of cases, the vendors and their software never come to the attention of malware creators, either because nobody bothered to look or a "trailblazer" vulnerability has yet to be discovered.
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