To , you can access it through the Official Apache Logging Services Mirror or the Maven Central Repository . This specific version was a critical security release issued on December 13, 2021, to address major flaws in the library's handling of JNDI lookups. Why Version 2.16.0 Was Critical
Log4j 2.16.0 was released shortly after the discovery of the "Log4Shell" vulnerability (CVE-2021-44228). While version 2.15.0 was the first attempt at a fix, it was quickly found to be insufficient in certain non-default configurations. CVE-2021-45046 Detail - NVD download log4j version 2.16.0