Crossfeed is a tool that continuously enumerates and monitors an organization's public-facing attack surface in order to discover assets and flag potential security flaws. By operating in either passive or active scanning modes, Crossfeed collects data from a variety of open source tools and data feeds to provide actionable information about organization assets. Crossfeed is offered as a self-service portal and allows customers to view reports and customize scans performed.
Crossfeed is a collaboration between the Cybersecurity and Infrastructure Security Agency and the Defense Digital Service.
See https://docs.crossfeed.cyber.dhs.gov for documentation on both how to use Crossfeed and how to contribute to it.
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