Definition
A threat feed is a curated stream of structured data containing information about current and emerging cyber threats. This data typically includes indicators of compromise such as malicious IP addresses, file hashes, domain names, and attack patterns. Security systems consume this information to proactively identify and block threats before they can impact an organization. Threat feeds are crucial for maintaining a strong security posture and adapting to the ever-changing threat landscape. For instance, a firewall can use a threat feed to automatically block connections to known malicious servers. It differs from a simple blocklist by providing richer context and more dynamic updates. Understanding threat feeds is essential for cybersecurity professionals and is covered in certifications like CompTIA Security+ and CISSP.