Methods, systems, and apparatus, including computer programs encoded on computer storage media, for determining threat data contextualization. One of the methods includes receiving data that identifies assets, attributes for each of the assets, and respective relevance ratings for the assets, receiving threat data that identifies vulnerabilities of particular attributes, determining vulnerability trends for the particular attributes, determining whether an attribute is one of the particular attributes identified in the threat data, updating the relevance ratings of the attribute using the vulnerability trends for the attribute, for each of two or more vulnerabilities identified in the threat data: determining the particular attributes affected by the vulnerability, and determining a score for the vulnerability using the respective relevance ratings for the particular attributes affected by the vulnerability, generating a ranking of the vulnerabilities using the corresponding scores, and generating instructions for presentation of a user interface that identifies each of the vulnerabilities.