CDMC-International Cybersecurity Data Mining Competition ( http://www.csmining.org ) is a world unique data-analytic competition sitting in the trans-disciplinary area of artificial intelligence and cybersecurity. In this paper, we summarize CDMC’19—the 10th cybersecurity data mining competition, which was held in Sydney Australia—together with a coupled workshop event, the Artificial Intelligence and Cyber Security (AICS) workshop 2019. We introduce the scope and background of the CDMC competition, the competition organizer, International Cyber Security Data-mining Society (ICSDS), and the rules that we followed to manage the competition. We reveal details of CDMC’19 regarding the competition tasks, participating teams, and the results the participants have achieved. Moreover, we publish the collection of CDMC’s 10-year competition datasets as the CDMC Cybersecurity Dataset Repository via http://archive.csmining.org . Finally, we conclude the paper with an outlook on the future activities of CDMC.