Zeek
Network detection and response (NDR) software
Network security software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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What is Zeek
Zeek is an open-source network security monitoring platform that analyzes network traffic and generates high-fidelity logs and events for detection, investigation, and incident response. Security teams deploy it on network taps/SPAN ports or sensor infrastructure to extract protocol metadata, files, and indicators from north-south and east-west traffic. It differentiates from many packaged NDR tools by providing a scripting framework and extensible analyzers that let teams tailor detections and telemetry to their environment. Zeek outputs structured logs that commonly feed SIEM, data lakes, and security analytics pipelines.
Rich protocol-level telemetry
Zeek parses many application-layer protocols and produces structured, queryable logs (e.g., connection, DNS, HTTP, TLS, files). This supports investigations and threat hunting without relying solely on packet capture. The data model is well-suited for correlation with endpoint and identity telemetry in downstream platforms.
Extensible scripting and analyzers
Zeek includes a domain-specific scripting language to create custom detections, enrichments, and policy logic. Teams can add or tune protocol analyzers and event handlers to match internal applications and network patterns. This flexibility is useful where packaged NDR detections do not cover bespoke protocols or unique environments.
Ecosystem and integration options
Zeek has a mature open-source ecosystem, including community scripts/packages and common integrations for log shipping and storage. It can export logs in formats that fit typical security pipelines (e.g., JSON) and integrate with message queues and collectors. This makes it practical as a sensor/telemetry layer alongside other security tools.
Requires engineering and tuning
Zeek is not a turnkey NDR product; it typically requires expertise to deploy sensors, manage updates, and tune scripts and detections. Building a complete detection-and-response workflow often depends on additional tooling for alerting, case management, and automation. Organizations without dedicated security engineering may find time-to-value longer than packaged platforms.
Operational overhead at scale
High-throughput networks can require careful sizing, load balancing, and storage planning for generated logs. Managing multiple sensors, configuration consistency, and performance tuning can become complex in large environments. Retention and search of Zeek logs usually require external storage/analytics infrastructure that adds cost and administration.
Response features are indirect
Zeek primarily provides monitoring and telemetry rather than built-in containment or automated response actions. Response typically occurs through integrations (e.g., SOAR, firewall/NAC, EDR) rather than native controls. Teams seeking an all-in-one NDR with integrated response and UI-driven workflows may need additional products.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| Community / Open-source | $0.00 | Zeek is distributed under a permissive BSD license; downloads and binaries available from the official site (zeek.org). No subscription or paid tiers listed on the vendor site. |
Seller details
Zeek Community
Berkeley, California, United States
1995
Open Source
https://zeek.org/
https://x.com/zeekurity
