OASIS Cyber Threat Intelligence (CTI) TC: A repository for commonly used STIX objects in order to avoid needless duplication. https://github.com/oasis-open/cti-stix-common-objects
Not all of the extensions have the same uuid:
Incident: extension-definition—ef765651-680c-498d-9894-99799f2fa126
Event: extension-definition—4ca6de00-5b0d-45ef-a1dc-ea7279ea910e
Impact: extension-definition—7cc33dd6-f6a1-489b-98ea-522d351d71b9
Task: extension-definition--2074a052-8be4-4932-849e-f5e7798e0030
Not all of the extensions have the same uuid: Incident: extension-definition—ef765651-680c-498d-9894-99799f2fa126 Event: extension-definition—4ca6de00-5b0d-45ef-a1dc-ea7279ea910e Impact: extension-definition—7cc33dd6-f6a1-489b-98ea-522d351d71b9 Task: extension-definition--2074a052-8be4-4932-849e-f5e7798e0030