An open source Java-based software tool available from the Apache Software Foundation designed to log security and performance information. 

CyberWire Glossary link: https://thecyberwire.com/glossary/log4j

Audio reference link: “CISA Director: The LOG4J Security Flaw Is the ‘Most Serious’ She’s Seen in Her Career,” by Eamon Javers (CNBC) and Jen Easterly (Cybersecurity and Infrastructure Security Director) YouTube, 20 December 20 2021.

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