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Researchers introduced a system for assessing the probability of exploiting vulnerabilities in real attacks

As you probably know, all systems are vulnerable. Annually, CVE identifiers are assigned to thousands of discovered vulnerabilities, and it’s almost impossible to monitor every new one. Exploit Prediction Scoring System maybe solve these problems

How to understand which companies correct immediately, and which ones can be put on hold, specialists tried to figure out at the Black Hat USA conference, which was held last week in Las Vegas.

Experts Michael Roytman from Kenna Security and Jay Jacobs from Cyentia Institute called vulnerability management a “malicious problem” because it is not comparable with the number of detected vulnerabilities.

“Every month, only 10% of all vulnerabilities are fixed. There are too many of them for companies to fix everything, so it’s necessary to develop a strategy that would solve this problem”, – experts consider.

The new strategy should help organizations figure out which vulnerabilities really need to be fixed. Theoretically, the CVSS rating system should help in this – the higher the rating, the more serious the problem.

However, all vulnerabilities that score 7 or higher according to CVSS are considered critical. There are still too many such “critical” vulnerabilities and it is impossible to understand which of them should be a priority.

“CVSS is just DoSing your patch installation policies and makes you throw money down the drain”, — said Roitman and Jacobs.

According to the researchers, only 2-5% of all critical vulnerabilities are actually exploited in real attacks. Therefore, it is necessary to create a system for assessing the risk of vulnerabilities, which would take into account the potential possibility of their exploitation on practice.

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According to Darkreading, the Exploit Prediction Scoring System (EPSS), introduced by Roitman and Jacobs at Black Hat USA, could become such a system. EPSS uses more than a dozen criteria to determine the feasibility of exploiting the vulnerability.

This includes CVE and CVSS assessment, presence of PoC exploits and exploits used by cybercriminals, the operating system, the vendor, and other variables. Taking into consideration all the above criteria, EPSS gives the percentage of probability of exploitation of a particular vulnerability in real attacks.

Read also: Crowdstrike study: threats to mobile devices have become much more sophisticated and dangerous

Roytman and Jacobs said that they will be making their methodology available as both an algorithm that can be configured and implemented by others and as an online calculator into which users can plug in data for an answer on any given CVE.

As of the posting of this story, the URL for the calculator (http://kennaresearch.com/tools/epss-calculator) was not yet active, but they said that the page, which will also include the white paper explaining the research that led to the new model, will be available soon after the conclusion of Black Hat.

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