A zero-day exploit is any attack that takes advantage of a previously unknown vulnerability and so hits targets that have had zero days in which to fix that security hole.True zero-day exploits are rare: there are, more often than not, plenty of people who are perfectly aware of the existence of a vulnerability, but the chances are they don’t work for you — they’re inhabitants of the demi-mondes of cybercrime and hacktivism. The wholesome developers of software and websites, along with the users of their products and services, are the ones that remain blissfully unaware of the coming security storm until it strikes on day zero.Any zero-day exploit should, you’d think, have a limited opportunity to infect software and systems. This is known as the ‘vulnerability window’ and applies to the time between the zero day being first launched and the time when developers issue a patch to fix the security problem. Unfortunately, many zero days have remarkably long vulnerability windows, for three main reasons:1. Exploits can be distributed, launched and active long before the vulnerability is discovered and work begins on a patch. Some Microsoft Windows vulnerabilities are thought to have had a window of opportunity spanning many years,… Read full this story
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