Wazuh

Overview

Wazuh was founded in 2015 as a fork of OSSEC and is an open source SIEM/XDR security monitoring platform, one of the most active community projects in the security monitoring space. The platform integrates log analysis, File Integrity Monitoring (FIM), vulnerability detection, threat hunting, and compliance management. It follows an Agent-Server architecture: lightweight agents on target hosts collect data, the Wazuh Manager performs centralized analysis, Elasticsearch provides storage and search, and Kibana delivers visualization dashboards.

As of 2026, Wazuh has over 10,000 GitHub Stars and 500+ community contributors, and is widely adopted by SMBs and security teams as a commercial SIEM replacement. Compared with commercial products such as Splunk, Wazuh covers both SIEM and XDR use cases at zero licensing cost. Combined with security log auditing basics, teams can quickly establish a complete security log baseline.

Key Strengths

• Fully Open Source — Zero License Fees: Wazuh is licensed under GPLv2 with all features free of charge, saving over 80% of security operations cost compared with commercial SIEM solutions such as Splunk, making it ideal for budget-constrained teams.
• Multi-Dimensional Security Monitoring: A single platform integrates log analysis, file integrity monitoring, vulnerability detection, intrusion detection, and compliance auditing, with 1,500+ built-in log parsing rules covering major operating systems, applications, and network devices.
• SCA Security Configuration Assessment: The Security Configuration Assessment module automatically checks system configurations against CIS Benchmark baselines (2,000+ items) and outputs quantified hardening gaps. Follow the security hardening practices to remediate item by item.
• Flexible Rule Engine: Rules are authored in XML and support 3 action types: event correlation, threshold controls, and automated active response, satisfying customized alert policies.
• Out-of-the-Box Compliance Auditing: 4 built-in compliance dashboard templates (PCI DSS, GDPR, HIPAA, and TSC) generate audit reports in one click, reducing compliance workload.

Product Ecosystem

Wazuh Manager (Server)

The Wazuh Manager is the platform's core engine, receiving agent data, executing rule analysis, generating alerts, and triggering responses. It supports both single-node and cluster deployments; cluster mode uses worker nodes to scale horizontally, suitable for managing 10,000+ agents.

Wazuh Agent (Endpoint)

Lightweight agents support Windows, macOS, Linux, AIX, and Solaris, collecting system logs, file integrity data, security configurations, and network connection information, transmitted to the Manager over encrypted channels.

Wazuh Indexer (Storage & Search)

Built on Elasticsearch, the Indexer provides indexing, search, and aggregation for massive security logs, with custom Index Lifecycle Management (ILM) policies balancing storage cost and query performance.

Wazuh Dashboard (Visualization)

Built on Kibana, the Dashboard provides security event overviews, threat maps, compliance reports, and custom charts, with built-in PCI DSS, GDPR, and HIPAA templates that generate audit reports in one click.

Limitations

• High Deployment and Operations Barrier: Full deployment involves Manager configuration, agent installation, Elasticsearch cluster tuning, and dashboard customization, requiring Linux and security operations expertise.
• Large-Scale Performance Tuning Difficulty: In environments managing 10,000+ agents, Elasticsearch index throughput, sharding strategy, and memory configuration require deep optimization to avoid alert latency.
• Commercial Support Costs Extra: Core features are free, but the official Wazuh Cloud managed service, technical support, and advanced training require paid subscriptions; community support relies on GitHub Issues and Slack.
• Community-Driven Threat Intelligence: Vulnerability and threat intelligence feeds update on a community cadence, less timely than commercial SIEM products, requiring additional threat intelligence sources.

Use Cases

• Budget-Sensitive SMB SIEM (★★★★★): A zero-licensing SIEM + XDR solution for SMBs and educational institutions that need enterprise-grade monitoring with limited budgets.
• Compliance Auditing & Reporting (★★★★★): Built-in PCI DSS, GDPR, and HIPAA dashboards suit organizations that must meet industry compliance requirements.
• Security Team Capability Building (★★★★): Suitable for technical teams with Linux fundamentals that want to build security operations capabilities through self-hosting Wazuh.
• Zero-Configuration Plug-and-Play (★★): Requires manual configuration and tuning; not suitable for teams expecting zero-maintenance operation.

Pricing

Note: Self-hosted deployment requires at least 2 servers (Manager + Elasticsearch, collapsible into one 8GB+ RAM node); production environments should use a 3-node Elasticsearch cluster.

FAQ

• How do Wazuh and Splunk compare? Wazuh is fully open source and free, with strengths in zero licensing cost and flexible customization. Splunk offers a more mature product ecosystem and official SLA support. Organizations with ample budgets and enterprise support needs may choose Splunk; technically capable teams with limited budgets should choose Wazuh—see the cloud monitoring services comparison.
• How many servers can Wazuh manage? A single Manager node manages thousands of agents, and cluster mode scales to tens of thousands. Actual performance depends on log throughput and Elasticsearch configuration—see the cloud server configuration guide.
• Does Wazuh support containers and cloud? Yes. It offers Docker containerized deployment, agents can run on Kubernetes nodes to collect container logs, and it supports AWS, Azure, and GCP log integration—see the Docker deployment guide.
• How accurate is Wazuh vulnerability detection? The module compares installed software versions against a CVE database covering 200,000+ CVEs. Accuracy depends on the completeness of the agent software inventory and CVE feed update frequency—see the website security checklist.