STIX, TAXII, and CYBOX

The Structured Threat Information Expression (STIX), Trusted Automated Exchange of Indicator Information (TAXII), and Cyber Observable Expression (CYBOX) tools are an open community-driven effort and a set of free, available specifications that help with the automated exchange of cyber threat information. This allows cyber threat information to be represented in a standardized format.

securityintelligence.com/how-stix-taxii-and-cybox-can-help-with-standardizing-threat-information/