The Cybersecurity Information Sharing Act of 2015 is a U.S. law focused on sharing cyber threat information. It provides a framework for organizations to exchange indicators of compromise and other threat data, helping defenders identify and respond to threats. The law concerns information sharing; it is not a technical defense that prevents exploitation by itself.
In practice, shared information can help organizations detect attack activity, assess exposure, and coordinate defensive steps. For critical infrastructure operators, timely threat data may support investigations and risk decisions, but it must be paired with measures such as asset inventory, vulnerability management, and safe change control. CISA 2015 is relevant to policy discussions about sustaining those sharing channels, including concerns that AI tools could accelerate vulnerability discovery or exploitation.