Where Severity Scores Go Wrong: “Just Add Prototype Pollution”

JFrog's Security Research team critically examines the discrepancy between assigned severity scores of vulnerabilities and their real-world impact, particularly focusing on Prototype Pollution vulnerabilities in JavaScript. Their research highlights that many vulnerabilities, including those affecting the popular Axios library, require pre-existing conditions such as an existing prototype pollution vulnerability to be exploitable, leading to inflated severity ratings. For instance, they demonstrated how a known Lodash vulnerability can be combined with Axios to execute a man-in-the-middle attack, emphasizing the importance of contextual analysis over theoretical severity scores. JFrog argues that traditional vulnerability scoring systems like CVSS often overestimate risk by not fully considering the specific environmental conditions required for exploitation. They advocate for a more nuanced approach to vulnerability assessment, which takes into account exploit prerequisites and real-world application contexts, enabling more accurate risk evaluations and prioritization for security teams.

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