Log4j is a tool to help the programmer output log statements to a variety of output targets. Security Fix: * log4j: SQL injection in Log4j 1.x when application is configured to use JDBCAppender * log4j: Unsafe deserialization flaw in Chainsaw log viewer * log4j: Remote code execution in Log4j 1.x when application is configured to use JMSSink For more details about the security issue, including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page listed in the References section.