We are pleased to announce that STIX Version 2.1 CSPRD03 from the OASIS Cyber Threat Intelligence (CTI) TC  is now available for public review and comment.
Structured Threat Information Expression (STIX) 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.
The documents and related files are available here:
STIX Version 2.1
Committee Specification Draft 04 / Public Review Draft 03
20 February 2020
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:
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 26 February 2020 at 00:00 UTC and ends 11 March 2020 at 11:59 UTC.
This specification was previously submitted for public review . This 15-day review is limited in scope to changes made from the previous reviews. Changes are highlighted in a red-lined DIFF file included in the package .
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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.
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========== Additional references:
 OASIS Cyber Threat Intelligence (CTI) TC
 Previous public reviews:
– 30-day public review, 14 August 2019:
– Comment resolution log:
– 15-day public review, 09 December 2019:
– Comment resolution log:
 Red-lined version: