Changes

In computing, a '''Zero-Day''' vulnerability (or "exploit") is a security hole in software which can permit unauthorized access, of which the [[software]] publisher has no knowledge.  Such vulnerabilities are given this name because the software developers (and other security firms) have known about the issue for zero days.  Once discovered, the publisher will usually rush to patch the vulnerability before it can be exploited any more that it already has been.<ref>http://www.pctools.com/security-news/zero-day-vulnerability</ref> Once a patch has been released, the vulnerability is no longer called a "zero-day" but may still be viable for some attacks for a time.  Some copies of the vulnerable software can remain unpatched for quite some time, leaving those vulnerable. In some cases, the patches themselves put out-of-date systems at risk, since new attackers can learn of vulnerabilities by analyzing the patches themselves.  Zero-day vulnerabilities can exist in [[operating system]]s and programs alike.<ref>http://thehackernews.com/2017/04/microsoft-word-zero-day.html</ref><ref>https://www.fireeye.com/current-threats/what-is-a-zero-day-exploit.html</ref>

In computing, a '''Zero-Day''' vulnerability (or "exploit") is a security hole in [[software]] which can permit unauthorized access, of which the software publisher has no knowledge.  Such vulnerabilities are given this name because the software developers (and the security community in general) have known about the issue for "zero days." Once discovered, the publisher will usually rush to patch the vulnerability before it can be exploited any more that it already has been.<ref>http://www.pctools.com/security-news/zero-day-vulnerability</ref> Once a patch has been released, the vulnerability is no longer called a "zero-day" but may still be viable for some attacks for a time.  Some copies of the vulnerable software can remain unpatched for quite some time, leaving those vulnerable. In some cases, the patches themselves put out-of-date systems at risk, since new attackers can learn of the vulnerabilities by analyzing the patches themselves.  Zero-day vulnerabilities can exist in [[operating system]]s and programs alike.<ref>http://thehackernews.com/2017/04/microsoft-word-zero-day.html</ref><ref>https://www.fireeye.com/current-threats/what-is-a-zero-day-exploit.html</ref>

==Protection==

==Protection==