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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.[1] OSSEC has a log analysis engine that is able to correlate and analyze logs from multiple devices and formats.[2]

Developer(s) Daniel B. Cid
Stable release
2.9.3 / December 23, 2017; 4 months ago (2017-12-23)
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.[3]

  • Manager (or server), which is required for distributed network or stand-alone installations.
  • Agent, a small program installed on the systems to be monitored.
  • Agentless mode, can be used to monitor firewalls, routers, and even Unix systems.

See alsoEdit


  1. ^ "About". OSSEC Project Team. 2017. Retrieved 2018-05-10. 
  2. ^ "Log Samples". OSSEC Project Team. 2017. Retrieved 2018-05-10. 
  3. ^ "OSSEC Architecture". OSSEC Project Team. 2017. Retrieved 2018-05-10. 

External linksEdit