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The methodology used by OpenVAS security scanner to give a global CVSS score to a host is to take the highest CVSS score in all vulnerabilities discovered. This means a host with five CVSS=2 will have a final CVSS score of 2 for OpenVAS, and the other one with two CVSS=10 will have a final CVSS score of 10. Strictly speaking of the function risk(CVSS)=..., ...


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Going back to high school probability math, the following should be close. Given amount valid keys in a space of size space, the chance of any random guess being correct is winChance = amount / space. Given a number of guesses (which is easily calculated from rate and time), the chance of finding 0 valid keys is (1-winChance) ^ guesses. That makes the ...


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For the expected case (average) the number of attempts has a linear relationship to the probability of success being considered. expected_time = probability * keyspace / ( rate * 2) So if the keyspace consisted of 1 billion codes and the attacker could brute force 1 million codes per second to have a 10% chance of success the attacker would need 50 ...



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