AlienVault® OSSIM™
Security information and event management (SIEM) software
Vulnerability scanner software
System security software
DevSecOps software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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What is AlienVault® OSSIM™
AlienVault OSSIM is an open source SIEM platform that centralizes security event collection, correlation, and alerting across network, host, and security tools. It is typically used by small to mid-sized security teams that need log management, basic threat detection, and compliance reporting without adopting a fully managed service. OSSIM combines SIEM functions with asset discovery and vulnerability assessment features through an integrated set of components. The project is historically associated with AlienVault and later AT&T Cybersecurity, and it is now aligned with the broader Open Threat Exchange (OTX) ecosystem for threat intelligence.
Integrated SIEM plus vulnerability data
OSSIM combines log collection/correlation with asset discovery and vulnerability scanning in a single platform. This can reduce the need to stitch together separate tools for basic detection and exposure context. The unified view helps analysts link alerts to affected assets and known weaknesses. For teams with limited tooling budgets, the bundled approach can be practical for baseline security monitoring.
Open source and extensible
OSSIM is distributed as open source software, which supports customization and internal control over deployment and data retention. It provides a plugin-based approach for ingesting events from common security and infrastructure sources. Organizations can adapt parsing, correlation directives, and integrations to fit local environments. This flexibility can be useful where commercial connectors or managed ingestion are not available.
Broad security telemetry coverage
The platform is designed to ingest multiple telemetry types, including logs, network events, and host-based signals. It supports correlation rules to connect events across sources into alarms. This helps teams move beyond single-source alerting and create more contextual detections. It also supports reporting workflows commonly used for audits and operational reviews.
Operational overhead and tuning
Running OSSIM requires ongoing administration for upgrades, storage management, rule tuning, and data source maintenance. Correlation directives and plugins often need adjustment to reduce false positives and ensure coverage. Compared with cloud-native analytics platforms, scaling ingestion and retention can be more manual. Teams without dedicated security engineering time may find day-to-day upkeep challenging.
Limited advanced analytics
OSSIM focuses on traditional SIEM correlation and does not provide the same depth of built-in behavioral analytics and automated response found in newer security operations platforms. Detection content and enrichment can require more custom work to reach comparable fidelity. Advanced investigation workflows (for example, large-scale entity analytics or automated case management) may be less mature. Organizations with high event volumes or complex environments may outgrow its native capabilities.
Unclear product stewardship
AlienVault as a company was acquired (AlienVault by AT&T; AT&T Cybersecurity later combined into a broader security business), and OSSIM’s positioning has shifted over time relative to commercial offerings. This can create uncertainty about long-term roadmap, release cadence, and support expectations for the open source edition. Enterprises that require vendor-backed SLAs typically need a commercial alternative. Users should validate current maintenance activity and community support before standardizing on it.
Seller details
AT&T Cybersecurity
Dallas, Texas, United States
2003
Public
https://cybersecurity.att.com/
https://x.com/ATTCyber
https://www.linkedin.com/company/att-cybersecurity
