![]() To a lesser extent, malicious cyber actors continued to exploit publicly known, dated software vulnerabilities-some of which were also routinely exploited in 2020 or earlier. For most of the top exploited vulnerabilities, researchers or other actors released proof of concept (POC) code within two weeks of the vulnerability’s disclosure, likely facilitating exploitation by a broader range of malicious actors. Globally, in 2021, malicious cyber actors targeted internet-facing systems, such as email servers and virtual private network (VPN) servers, with exploits of newly disclosed vulnerabilities. These mitigations include applying timely patches to systems and implementing a centralized patch management system to reduce the risk of compromise by malicious cyber actors.ĭownload the Joint Cybersecurity Advisory: 2021 top Routinely Exploited Vulnerabilities (pdf, 777kb). The cybersecurity authorities encourage organizations to apply the recommendations in the Mitigations section of this CSA. To a lesser extent, malicious cyber actors continued to exploit publicly known, dated software vulnerabilities across a broad spectrum of targets. U.S., Australian, Canadian, New Zealand, and UK cybersecurity authorities assess, in 2021, malicious cyber actors aggressively targeted newly disclosed critical software vulnerabilities against broad target sets, including public and private sector organizations worldwide. ![]() This advisory 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. This joint Cybersecurity Advisory (CSA) was coauthored by cybersecurity authorities of the United States, Australia, Canada, New Zealand, and the United Kingdom: the Cybersecurity and Infrastructure Security Agency ( CISA), National Security Agency ( NSA), Federal Bureau of Investigation ( FBI), Australian Cyber Security Centre ( ACSC), Canadian Centre for Cyber Security ( CCCS), New Zealand National Cyber Security Centre ( NZ NCSC), and United Kingdom’s National Cyber Security Centre ( NCSC-UK). ![]()
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