What Is MISP? The Open-Source Threat Intelligence Platform

MISP — the Malware Information Sharing Platform & Threat Sharing — is the most widely used open-source threat intelligence platform in the world. It is a free, community-driven tool for storing, correlating and — above all — sharing structured cyber threat intelligence. If your organization wants to operationalize indicators of compromise and collaborate with trusted partners without buying a commercial platform, MISP is usually the first stop.

Originally focused on malware indicators (hence the name), MISP has grown into a full-featured platform for managing all kinds of threat data, used by CERTs, ISACs, governments and private companies globally.

What MISP does

MISP organizes threat intelligence into events — collections of related information about an incident, campaign or analysis — each containing attributes (the individual data points like IPs, domains, hashes and more). Around this core, MISP provides:

• Storage and structure. A central, organized repository for indicators and the context around them.
• Automatic correlation. MISP automatically links events that share attributes, revealing connections between seemingly separate incidents — a powerful way to spot that two intrusions involve the same actor or infrastructure.
• Sharing. Its defining feature. MISP lets organizations share intelligence with trusted communities through flexible, granular controls over exactly who sees what.
• Tagging and taxonomies. Rich tagging (including the Traffic Light Protocol for handling sensitivity, and mappings to MITRE ATT&CK) to classify and filter data.
• Export and integration. Feeds indicators into other security tools — SIEM, IDS, firewalls — in many formats, and supports STIX.
• Feeds. Ingests dozens of free and commercial threat feeds out of the box.

Why MISP's sharing model matters

MISP was built around a simple but powerful idea: collective defense. When one organization detects a threat and shares the indicators, every other member of the community can immediately check for and block the same threat. This turns isolated incidents into shared early warning.

The sharing is highly configurable. Organizations form sharing communities (such as an industry ISAC), and granular settings control whether a given event stays private, is shared within a community, or is published more broadly. The Traffic Light Protocol (TLP) tags help everyone respect the originator's handling restrictions. This balance of openness and control is what makes MISP trusted for sensitive intelligence sharing.

How organizations use MISP

• As a central IOC repository — the single source of truth for indicators, replacing scattered spreadsheets.
• To operationalize intelligence — exporting curated indicators into detection and blocking tools.
• To participate in sharing communities — both consuming and contributing intelligence with trusted peers.
• To correlate and investigate — using automatic correlation to connect events and enrich understanding of a campaign.
• To ingest and curate feeds — pulling in free and commercial feeds, deduplicating and contextualizing them.

Getting started with MISP

MISP is free and self-hosted, with official virtual machines and container images to simplify deployment. Because it's self-hosted, it does require resources to run and maintain — server infrastructure, updates and someone to administer it. Many teams begin by deploying MISP, connecting a few free feeds, and joining a relevant sharing community, then expand into custom feeds and tool integrations as their program matures. For a wider view of the ecosystem, see our guide to open-source threat intelligence tools.

MISP vs OpenCTI

MISP is often compared to OpenCTI, the other leading open-source platform. MISP is indicator- and sharing-centric — superb for storing, correlating and exchanging IOCs with communities. OpenCTI is knowledge- and relationship-centric — a graph database for modeling the connections between actors, campaigns, malware and TTPs. They're complementary, and many mature teams run both: MISP for indicator sharing, OpenCTI for structured knowledge.

Getting the most out of MISP

MISP rewards organizations that approach it deliberately. Standing up the software is the easy part; turning it into a living, valuable capability takes some discipline. A few practices consistently separate thriving MISP deployments from neglected ones:

• Join active sharing communities. MISP's defining strength is sharing, and that value is multiplied by the community you're part of. Connecting to a relevant ISAC or trusted group transforms MISP from a private database into a collective early-warning system.
• Contribute, don't just consume. Communities thrive on reciprocity. Sharing your own observations — even modestly — strengthens the whole group and improves what you receive in return.
• Use tagging and taxonomies consistently. Disciplined tagging (including the Traffic Light Protocol for handling restrictions and ATT&CK mappings) is what makes your data searchable, filterable and trustworthy over time.
• Operationalize the output. Connect MISP to your SIEM, firewalls and EDR so curated indicators actually drive detection and blocking, rather than sitting in the platform.
• Curate your feeds. MISP can ingest many feeds, but more isn't better. Enable the ones relevant to you and let MISP's correlation surface connections, while keeping noise in check.
• Expire and maintain data. Stale indicators cause false positives. Use MISP's features to age out old data and keep the dataset clean.

It's also worth being realistic about the commitment. As self-hosted software, MISP requires infrastructure, updates and an owner who tends to it. Organizations that assign clear responsibility and integrate MISP into their daily workflow get enormous value from it; those that deploy it and walk away end up with another neglected tool. Treated as the operational hub of a sharing-oriented intelligence program — and fed a steady stream of relevant, current reporting — MISP delivers exactly what it was designed for: turning isolated observations into collective defense. The communities and integrations you build around it matter as much as the platform itself.

Quick recap:

• MISP is the leading open-source, community-driven threat intelligence platform, built around sharing and collective defense.
• It organizes intelligence into events and attributes, automatically correlates related data, and shares it with trusted communities via granular controls.
• It's indicator- and sharing-centric (versus OpenCTI's graph-based, relationship-centric model) — many teams run both.
• It's free but self-hosted; value comes from joining active communities, contributing, tagging consistently, operationalizing output and maintaining clean data.

The bottom line

MISP is the de facto open-source standard for storing, correlating and sharing threat intelligence — free, community-driven, and built around collective defense. It's the natural foundation for any team that wants to operationalize indicators and collaborate with trusted peers. To keep your MISP instance fed with what's breaking now, our live threat intelligence feed aggregates and priority-ranks reporting from dozens of authoritative sources in real time.