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Subject: Invitation to comment on STIX V2.1 and TAXII V2.1 from the CTI TC - ends December 24th

OASIS Members and other interested parties,

We are pleased to announce that STIXâ Version 2.1 CSPRD02 and TAXIIâ Version 2.1 CSPRD03 from the OASIS Cyber Threat Intelligence (CTI) TC [1] are now available for public review and comment.

Structured Threat Information _expression_ (STIXâ) is a language and serialization format used to exchange cyber threat intelligence. STIX enables organizations and tools to share threat intelligence with one another in a way that improves many different capabilities, such as collaborative threat analysis, automated threat exchange, automated detection and response, and more.

STIX V2.1 adds new objects and concepts and incorporates improvements based on experience implementing version 2.0. The objects and features added for inclusion represent an iterative approach to fulfilling basic consumer and producer requirements for CTI sharing. Objects and properties not included in this version of STIX, but deemed necessary by the community, will be included in future releases.

Trusted Automated Exchange of Intelligence Information (TAXII) is an application layer protocol used to exchange cyber threat intelligence (CTI) over HTTPS. It enables organizations to share CTI by defining an API that aligns with common sharing models.

TAXII is specifically designed to support the exchange of CTI represented in STIX. As such, the examples and some features in the specification are intended to align with STIX. This does not mean TAXII cannot be used to share data in other formats; it is designed for STIX, but is not limited to STIX.

The documents and related files are available here:

- STIXâ Version 2.1
Committee Specification Draft 02 / Public Review Draft 02
29 November 2019

Editable source (Authoritative):



- TAXIIâ Version 2.1
Committee Specification Draft 04 / Public Review Draft 03
22 November 2019

Editable source (Authoritative):



For your convenience, OASIS provides a complete package of the prose specification and related files in a ZIP distribution file. You can download the ZIP file at:

- STIXâ Version 2.1: https://docs.oasis-open.org/cti/stix/v2.1/csprd02/stix-v2.1-csprd02.zip

- TAXIIâ Version 2.1: https://docs.oasis-open.org/cti/taxii/v2.1/csprd03/taxii-v2.1-csprd03.zip

How to Provide Feedback

OASIS and the CTI TC value your feedback. We solicit feedback from potential users, developers and others, whether OASIS members or not, for the sake of improving the interoperability and quality of its technical work.

This public review starts 10 December 2019 at 00:00 UTC and ends 24 December 2019 at 11:59 UTC.

This specification was previously submitted for public review [2]. This 15-day review is limited in scope to changes made from the previous reviews. Changes are highlighted in red-lined DIFF files included in the package [3].

Comments on the work may be submitted to the TC by following the instructions located at:


Feedback submitted by TC non-members for this work and for other work of this TC is publicly archived and can be viewed at:


All comments submitted to OASIS are subject to the OASIS Feedback License, which ensures that the feedback you provide carries the same obligations at least as the obligations of the TC members. In connection with the public review of these works, we call your attention to the OASIS IPR Policy [4] applicable especially [5] to the work of this technical committee. All members of the TC should be familiar with this document, which may create obligations regarding the disclosure and availability of a member's patent, copyright, trademark and license rights that read on an approved OASIS specification.

OASIS invites any persons who know of any such claims to disclose these if they may be essential to the implementation of the above specification, so that notice of them may be posted to the notice page for this TC's work.

Additional information about this specification and the <tc name> TC may be found on the TC's public home page.

========== Additional references:

[1] OASIS Cyber Threat Intelligence (CTI) TC

[2] ÂPrevious public reviews:

- STIXâ Version 2.1:
 - 30-day public review, 14 August 2019:
 - Comment resolution log:

- TAXIIâ Version 2.1:
 - 30-day public review, 22 December 2018:
 - Comment resolution log:

 - 15-day public review, 14 August 2019:
 - Comment resolution log:

[3] Red-lined version:

- STIXâ Version 2.1: http://docs.oasis-open.org/cti/stix/v2.1/csprd02/stix-v2.1-csprd02-DIFF.pdf

- TAXIIâ Version 2.1: http://docs.oasis-open.org/cti/taxii/v2.1/csprd03/taxii-v2.1-csprd03-DIFF.pdf

[4] http://www.oasis-open.org/policies-guidelines/ipr

[5] http://www.oasis-open.org/committees/cti/ipr.php
Non-Assertion Mode


Chet Ensign
Chief Technical Community Steward
OASIS: Advancing open source & open standards for the information society

Mobile: +1 201-341-1393Â

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