Security Onion is a free and open Linux distribution for threat hunting, enterprise security monitoring, and log management. It was developed by Doug Burks in 2008. Its first release was in 2009. It was originally based on Xubuntu 10.04. Version 2.4.140 was released on March 24, 2025. As of 2025 Security Onion includes Elastic Agent, which handles HIDS and endpoint monitoring. System requirements have increased with the Security Onion Manager server needing at least 16 GB RAM or more. Previous versions of Security Onion integrated Wazuh for HIDS. Wazuh has been replaced by Elastic agent in the 2025 version of Security Onion. More information...
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