Pick a metric that has not already been selected by another student, and describe the factor in your own words. Also, describe the possible values and their meanings. In other words, suggest how the default, N/A and other values contribute to the overall CWE score.

This is tricky as you need to work through some score calculation examples to really understand the impact. You should work through those examples to support your conclusions.

The metric I choose is:

Likelihood of Exploit (EX)

the likelihood that, if the weakness is discovered, an attacker with the required privileges/authentication/access would be able to successfully exploit it.