The 2021 Threat Landscape Retrospective Report is sourced by Tenable in January 2022. Learn more about Tenable, here.The 2021 edition of the Threat Landscape Retrospective looks at the major vulnerabilities and security incidents that marked 2021, evaluate the impact on cloud and Active Directory environments and explore the tactics used by attackers to breach organisations by holding them to ransom. This report is a valuable resource for security professionals seeking to improve their understanding of the threat landscape in with a goal to improve their security in 2022.