NIST SP 800-150: cyber threat information sharing, explained

NIST SP 800-150, Guide to Cyber Threat Information Sharing, is an October 2016 NIST Special Publication that tells an organization how to stand up and participate in relationships for exchanging cyber threat information — not just what to share, but with whom, under what rules, and how to make the information actionable once it arrives. NIST's own abstract frames the stakes directly: "organizations that share cyber threat information can improve their own security postures as well as those of other organizations." The guide was written primarily for US federal agencies but, per its own Section 1.2, is "intended to be applicable to a wide variety of governmental and non-governmental organizations" — a device maker's PSIRT or an OT asset owner's security team can use the same structure.

What counts as "threat information"

Section 2.1 breaks cyber threat information into five types, moving from raw to refined: indicators (technical artifacts such as a malicious IP, domain or file hash), TTPs (tactics, techniques and procedures describing an actor's behavior at increasing levels of detail), security alerts (human-readable advisories and vulnerability notes, sourced from places like US-CERT, ISACs, the NVD or PSIRTs), threat intelligence reports (prose analysis that adds context for a decision-maker), and tool configurations (concrete artifacts such as IDS signatures or firewall rules built from the other four types). The guide's own framing is that most organizations already produce several of these internally as part of routine incident response — SP 800-150's stated goal is to extend that internal practice "across organizational boundaries."

Standing up a sharing relationship

Section 3 lays out the steps in order: define sharing goals and objectives; identify the internal sources that already produce shareable information; scope what will be shared and with whom; establish sharing rules that "control the publication and distribution of threat information"; join a sharing community; and plan ongoing support so the relationship survives past its first incident. The guide is explicit that sharing agreements should be set up before an incident, not during one — "rather than attempting to establish sharing agreements during an active cyber incident, organizations should plan ahead and have agreements in place before incidents occur."

Sharing designations: the Traffic Light Protocol

Section 3.4.2 points to the Traffic Light Protocol (TLP) as the framework for marking how far a piece of shared information may travel, and Table 3-3 reproduces it under the explicit label "Traffic Light Protocol, Version 1.0" — four colors (RED, AMBER, GREEN, WHITE), each paired with a one-line "when should it be used" and "how may it be shared" rule. That table is a 2016 snapshot, not the current standard: FIRST, the body that maintains TLP, states its authoritative version today is TLP 2.0, in effect since August 2022 — the same RED/AMBER/GREEN core, but AMBER now splits into AMBER and a stricter AMBER+STRICT (no sharing with clients), and WHITE was renamed TLP:CLEAR. A team adopting SP 800-150's sharing-rules chapter today should carry over the concept of graduated sharing designations but apply FIRST's current five-label TLP v2.0, not the four-label v1.0 table printed in the document.

Who you actually share with

Section 3.5 names the realistic set of sharing partners: ISACs, domestic and foreign CERTs/CSIRTs, Information Sharing and Analysis Organizations (ISAOs), DHS's Automated Indicator Sharing (AIS) initiative, vulnerability repositories, law enforcement, vendors, managed security service providers, ISPs, supply-chain partners, sector peers, business partners and customers. The guide distinguishes informal communities — "self-organizing groups that largely operate through voluntary cooperation" under "basic rules of conduct" — from more structured ones with defined membership and formal agreements, and notes that community composition often follows a geographic, sector, or threat-specific boundary rather than a single universal model.

A workable starting point

1. Inventory what you already produce before looking outward. Most organizations generate indicators, alerts and TTP observations internally as a side effect of incident response; SP 800-150's first step is identifying those existing sources, not building new collection from scratch.
2. Write sharing rules before you need them. Decide in advance what can be shared, with whom, and under what designation — doing this mid-incident is the failure mode the guide calls out explicitly.
3. Use TLP v2.0, not the v1.0 table in the 2016 PDF. The concept (graduated, labeled sharing designations) is still sound; the specific four-color table in SP 800-150 predates FIRST's current five-label standard.
4. Match the community to the goal. An informal, voluntary-cooperation community suits ad hoc indicator exchange; a sector ISAC or ISAO suits a sustained, higher-trust relationship — SP 800-150's own taxonomy is a useful checklist when choosing which to join first.

SoftWSP's PSIRT setup work builds the intake, triage and disclosure side of this; the same program is also the natural place to formalize what a hardware or firmware maker shares outward with its sector's ISAC or ISAO: see PSIRT.

This guide summarises NIST Special Publication 800-150 (October 2016) and FIRST's current Traffic Light Protocol standard, as checked on 28 October 2026; it does not constitute security or compliance advice.