OSSEC v4.0.0
OSSEC is a full platform to monitor and control your systems. It mixes together all the aspects of HIDS (host-based intrusion detection), log monitoring and SIM/SIEM together in a simple, powerful and open source solution.
Visit our website for the latest information. www.ossec.net
The current stable releases are available on the ossec website.
When built with USE_CURL=yes, failed SMTP sends log detailed libcurl errors in ossec.log: a TLS verification category line when certificate checks fail, curl_easy_strerror text, optional CURLOPT_ERRORBUFFER detail, CURLINFO_SSL_VERIFYRESULT (backend-specific), and CURLINFO_OS_ERRNO when set. See comments at the top of src/os_maild/curlmail.c.
The development version is hosted on GitHub and just a simple git clone away.
File Integrity Monitoring
Attack Detection
Join us on slack, ossec.slack.com: Invites to slack@ossec.net
Join us on Discord: https://discord.gg/BXzM75Xzq7
- OSSEC comes with a modified version of zlib and a small part of openssl (sha1 and blowfish libraries)
- This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (http://www.openssl.org/)
- This product includes cryptographic software written by Eric Young (eay@cryptsoft.com)
- This product include software developed by the zlib project (Jean-loup Gailly and Mark Adler)
- This product include software developed by the cJSON project (Dave Gamble)
- Atomicorp hosting the annual OSSEC conference. Presentations for the 2019 conference can be found at https://www.atomicorp.com/ossec-con2019/

