Ossec
Intrusion detection and prevention systems (IDPS)
Network security software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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$55 per endpoint per year
Free TrialFree version
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What is Ossec
OSSEC is an open-source host-based intrusion detection system (HIDS) used to monitor endpoints and servers for suspicious activity and policy violations. It performs log analysis, file integrity monitoring, rootkit detection, and active response actions based on rules and alerts. Typical users include security teams and system administrators who need endpoint-level detection across Linux, Windows, and macOS environments. It is commonly deployed as a manager/agent architecture, with centralized alerting and rule management.
Mature HIDS feature set
OSSEC provides core host-based detection capabilities such as log analysis, file integrity monitoring, and rootkit checks. It supports rule-based correlation and alerting that can be tuned to specific systems and compliance needs. These capabilities make it suitable for baseline endpoint monitoring where network-only telemetry is insufficient.
Cross-platform agent support
OSSEC supports agents for major operating systems, including Linux and Windows, enabling consistent host monitoring across mixed environments. The manager/agent model allows centralized policy and rule distribution. This helps organizations standardize endpoint detection without requiring a single OS ecosystem.
Open-source and extensible
As an open-source project, OSSEC can be inspected, modified, and extended to fit internal requirements. It integrates with common logging and alerting workflows through its outputs and rule framework. This can be advantageous for teams that prefer self-managed tooling and customization over vendor-managed platforms.
Limited network-centric visibility
OSSEC focuses on host telemetry rather than deep network traffic analysis. It does not provide the same level of network detection, packet/flow analytics, or network behavior modeling found in network-focused security platforms. Organizations often need complementary tools to cover east-west and north-south network monitoring.
Operational overhead for tuning
Effective use typically requires ongoing rule tuning, whitelist management, and alert triage to control false positives. Deployments at scale can require significant effort to maintain consistent configurations across many endpoints. Teams without dedicated security engineering resources may find day-to-day operations demanding.
No single commercial vendor
OSSEC is an open-source project rather than a single commercial SaaS product with a unified support and roadmap commitment. Enterprise-grade support, packaged distributions, and managed services depend on third parties or internal expertise. This can be a constraint for organizations that require vendor SLAs and turnkey deployment.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| OSSEC (open-source) | Free | Core OSSEC HIDS: log-based intrusion detection, file integrity monitoring (FIM), rootkit detection, active response, compliance auditing. Downloadable binaries and source. (Official: ossec.net). |
| OSSEC+ | Free (requires registration) | Enhanced free ruleset: machine learning, real-time community threat sharing, 1000s of additional rules, ELK/OpenSearch integrations. Free with registration. |
| Atomic OSSEC (commercial) | Starts at $55 per endpoint/year (under $5 per agent per month) | Enterprise-grade XDR: thousands of additional rules, GUI, centralized agent management, daily updates, AV integration, vulnerability management, SIEM/EDR features, compliance reporting, professional support. Available on-premise or SaaS; volume discounts and agentless options; trial & demo available. |
