Framework overlap

Does SSAE 18 cover ISO 27005?

You hold SSAE 18 and have been told to do ISO 27005. Here is how much overlaps, control by control.

35% of ISO 27005 you already have

SSAE 18 already covers about 35% of ISO 27005, leaving 17 of 26 controls as genuinely new work.

Already covered 6 Likely covered 3 New work 17

What is genuinely new work

Nothing in SSAE 18 reaches these. This is the list to scope.

7.5
Threat assessment
7.7
Likelihood estimation
7.8
Consequence estimation
8.3
Statement of Applicability linkage
ISO27005-02
Risk governance structure
ISO27005-03
Risk culture and communication
ISO27005-04
Stakeholder requirements for risk
ISO27005-07
Risk analysis and evaluation
ISO27005-09
Risk scenario development
ISO27005-11
Risk treatment options and selection
ISO27005-12
Risk treatment plan development
ISO27005-13
Residual risk acceptance
ISO27005-14
Risk transfer and insurance
ISO27005-15
Control implementation and monitoring
ISO27005-16
Risk monitoring procedures
ISO27005-17
Risk reporting and communication
ISO27005-20
Management review of risk program
Show the 9 you already have
ISO27005-01
Risk management policy and scope
ISO27005-05
Risk management integration
ISO27005-06
Risk identification methods
ISO27005-08
Risk criteria and thresholds
ISO27005-10
Risk interdependency analysis
ISO27005-18
Risk register maintenance
8.5
Control effectiveness review
9.1
Risk communication and consultation
ISO27005-19
Continuous improvement of risk processes

How this is calculated

Already covered means a mapping runs from a control in SSAE 18 to that control. Likely covered means no direct mapping exists but both frameworks map to the same control in a third standard. New work means neither. We keep those separate rather than adding them into one friendlier number, because blending them would present a two-hop inference as a verified fact.

Coverage is not symmetric. Run it the other way and you will get a different number; both are correct.

From 332,959 cross-framework control mappings across 723 frameworks, 531 of them verified against their source documents. It does not tell you that you are compliant: a mapped control means the two standards ask for the same thing, not that you have done it.

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