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Thanks for articulating your question and the criteria.
On your criteria, #2 is the most relevant to criticality. The others are dealing with that impact of a vendor failure and not its criticality: reputation, replacement, and external examination or notification requirements are part of doing business.
Perhaps thinking in terms of business continuity would provide criticality
For BC/DR plans, we asked two questions about the availability of our IT operations:
- Until services are restored, can you operate even if manual?
- If your access to your office is denied (no physical building access) can you continue to operate?
- Are you maintaining processes to have all available resources that are must-have for your business unit (master case lists, court calendars, etc) until services are restored? (designated persons, call chains, secondary command centers, etc.)?
Now shifting to vendors, I also ask the following to determine criticality:
- what forms of governance and external assessments are readily available and conducted at least annually? which are available to us?
- will the vendor modify their contract to provide full cooperation including evidence gathering to fulfill formal requests and/or requirements by regulators, third party assessments and incident-related forensic discovery? Is this standard operating procedures or one-off negotiation?
- what is the vendor's risk rating based on access (in any form or process) to non-public information?
- can the vendor operate with solely on-shore (US) personnel, even in terms of their backup, site failover and monitoring?
- do they have an operating and effective security posture with underlying program, policies, controls and procedures?
- do they have 24x7 monitoring, threat analysis, configuration due diligence, data encryption, access controls, awareness training, and software life cycle security?
- what is their history of vulnerabilities, security incidents, data breaches, external penetration testing, time to remediate, policy reviews?
- Do they guarantee access to our data even if the third party is out of business? Upon termination? During transition to replacement vendor?
Sorry if there are technical concepts mixed in, but with third parties, especially those that deliver services via a Software-as-a-Service (SaaS) model, the ability to be fully transparent to regulators, executives, board of directors requires a new meaning to criticality and vendor management to close the gaps or at least identify them to manage risk.