Severity of a vulnerability

​There are couple of factors that need to be mentioned about vulnerabilities. First one is how easy that vulnerability to exploit. If such a vulnerability is very difficult to exploit then an attacker will need to spend a lot of time and effort to use such a vulnerability.

Second factor is the impact. A vulnerability may exist, but what danger it represents if not patched. Some vulnerabilities will provide an attacker with additional information, such as version of a web server that is being used. By itself it is just information only vulnerability, however if this information is contained with other sources, then it can represent more danger. For example an attacker may learn for such a web server can be exploited.

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