The Cyber Defense Assistance Collaborative (CDAC) is a group of leading cybersecurity companies, former U.S. government officials, and top U.S. cyber defense leaders who came together to provide operational cyber defense assistance to Ukraine during the 2022 Russian invasion.

Currently, CDAC works in collaboration with participating private sector cyber security organizations to meet cyber defense aid requests from Ukrainian government ministries and state-owned organizations. CDAC assistance has come in the form of the provision of cutting-edge tools and cyber threat intelligence to protect critical infrastructure.