CISA, the National Security Agency (NSA), the Federal Bureau of Investigation (FBI), the Australian Cyber Security Centre (ACSC), the Canadian Centre for Cyber Security (CCCS), the New Zealand National Cyber Security Centre (NZ NCSC), and the United Kingdom’s National Cyber Security Centre (NCSC-UK) have released a joint Cybersecurity Advisory that provides details on the top 15 common vulnerabilities and exposures (CVEs) routinely exploited by malicious cyber actors in 2021, as well as other CVEs frequently exploited.