The 2021 Common Weakness Enumeration (CWE) Top 25 Most Dangerous Software Weaknesses is a demonstrative list of the most common issues experienced over the previous two calendar years. These weaknesses are risky because they are many times easy to find, exploit, and can allow adversaries to take over a system, steal data, or prevent an application from working. The CWE Team leveraged Common Vulnerabilities and Exposures (CVE) data found within the NIST National Vulnerability Database (NVD) to create the 2021 list.
Source: https://www.helpnetsecurity.com/2021/08/02/2021-cwe-top-25/