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OSSEC (Open Source HIDS SEcurity) is a free, open-source host-based intrusion detection system (HIDS). It performs log analysis, integrity checking, Windows registry monitoring, rootkit detection, time-based alerting, and active response. It provides intrusion detection for most operating systems, including Linux, OpenBSD, FreeBSD, OS X, Solaris and Windows. OSSEC has a centralized, cross-platform architecture allowing multiple systems to be easily monitored and managed.

Developer(s) Daniel B. Cid
Stable release
2.9.1 / June 19, 2017; 8 months ago (2017-06-19)
Operating system Cross-platform
Type Security / HIDS
License GNU GPL v2



In June 2008, the OSSEC project and all the copyrights owned by Cid, the project leader, were acquired by Third Brigade, Inc. They promised to continue to contribute to the open source community and to extend commercial support and training to the OSSEC open source community.

In May 2009, Trend Micro acquired Third Brigade and the OSSEC project, with promises to keep it open source and free.

It is compliant with Payment Card Industry Data Security Standard (PCI DSS) requirements.

Software componentsEdit

OSSEC consists of a main application, a Windows agent, and a web interface.

  • Main application, OSSEC, which is required for distributed network or stand-alone installations. It is supported by Linux, Solaris, BSD, and Mac environments.
  • Windows agent, which is provided for Microsoft Windows environments. The main application needs to be installed and configured for server mode to support the Windows Agent.
  • Web interface (deprecated), which as a separate application provides a graphical user interface. Like the main application, it is supported by Linux, Solaris, BSD, and Mac environments. It is now suggested to use Kibana, Splunk Graylog or something similar for monitoring alerts.


OSSEC has a log analysis engine that is able to correlate and analyze logs from multiple devices and formats. The following are currently[when?] supported:

See alsoEdit


External linksEdit