Changes

A wide variety of dangers and risk exist, which Internet security efforts must try to avoid or resolve.  The following are some (but not all) of these dangers.

A wide variety of dangers and risk exist, which Internet security efforts must try to avoid or resolve.  The following are some (but not all) of these dangers.

===Vulnerabilities/flaws===

===Vulnerabilities/flaws===

One serious risk to Internet security is that of vulnerabilities in the systems already in use.  Once found, these vulnerabilities must be fixes (usually using software patches), but with so many different parts of so many different systems in play today, there is almost guaranteed to be a problem somewhere that can be exploited if anyone finds it.  These "zero-day" vulnerabilities are an ongoing problem, since by definition they are yet unknown.  However, another problem is that once such an issue is discovered, not everyone installs the patch or update required to resolve the issue.  Once the patch is released, malicious users can examine the fix and immediately go to work trying to find unpatched systems which can be attacked using this new method.

One serious risk to Internet security is that of vulnerabilities in the systems already in use.  Once found, these vulnerabilities must be fixed (typically using software patches), but with so many different parts of so many different systems in play today, there is almost guaranteed to be a problem somewhere that can be exploited if anyone finds it.  These "zero-day" vulnerabilities are an ongoing problem, since by definition they are yet unknown.  However, another problem is that once such an issue is discovered, not everyone installs the patch or update required to resolve the issue.  Once the patch is released, malicious users can examine the fix and immediately go to work trying to find unpatched systems which can be attacked using this new method.

===Denial-of-service attacks===

===Denial-of-service attacks===