I had no idea that the CVSS topic would turn into a five post series. There was just too much information and thoughts to cram into one or even two posts so for those of you that read even a few let alone all five – thanks for persevering.
Final thoughts on CVSS; two good and two not so good:
NOT SO GOOD:
1. The CVSS framework is probably not being *fully embraced* or properly utilized by the people that need to leverage it the most – consumers of vendors that use it to score vulnerabilities with their products. Scoring the environmental metrics and observing the impact to the base metrics could add a lot of value. Other frameworks or organizations that reference CVSS scores as part of a vulnerability management process should mention the optional metrics that can influence the base score that a vendor provides. Better yet, maybe throw a disclaimer that the CVSS score listed today may be outdated and needs to be updated.
2. The CVSS risk vernacular needs to be updated. I would recommend that the CVSS-SOG consider participating in “The Open Group” “Risk Management and Analysis Taxonomy” forum. Better yet, the CVSS-SOG should consider adopting the FAIR methodology. Specifically, use CVSS metrics that could factor into FAIR taxonomy elements. Some of the CVSS metrics focus more on impact then on the vulnerability itself. This can be a slippery slope especially when there are no metrics for “threat event frequency” let alone “loss event frequency”.
1. Pretty much all the CVSS metrics have some usefulness and should be able to be used by most information security professionals and especially risk analysts. I am already creating a small utility to use so I can consistently analyze various vulnerabilities and when appropriate – use the metrics as contributing factors for FAIR.
2. Industry adoption. A lot of vendors use the CVSS framework. PCI-DSS references it for vulnerability related PCI guidelines. Just remember, use the whole framework and do not rely upon what is spoon-fed to you by PCI QSAs or value added resellers. If applicable, take back your ability to analyze risk and make informed decisions.
There you have it. Again, thanks for reading and submitting comments. The feedback and scrutiny has been well taken and appreciated.