COSO Principle 10 — The entity selects and develops control activities that contribute to the mitigation of risks to acceptable levels.
Also written as CC 5.1, TSC CC5.1, SOC2 CC5.1, SOC 2 Type 2 CC5.1.
Control activities mitigating risk is one of 3 criteria in the Control Activities (CC5) series of the Security (Common Criteria) category. COSO Principle 10 — The entity selects and develops control activities that contribute to the mitigation of risks to acceptable levels. CC5 links the risks from CC3 to concrete control activities, so the strongest evidence is a control matrix showing which control addresses which risk and who owns it.
When preparing for a SOC 2 audit against CC5.1, gather artefacts such as:
CC5.1 corresponds to the following ISO 27001:2022 Annex A control(s): A.5.3. If you already run an ISO 27001 ISMS, map your existing evidence for these controls to CC5.1 rather than duplicating work.
Yes. CC5.1 sits in the Common Criteria, which apply to every SOC 2 engagement regardless of which additional categories you scope in — there is no SOC 2 report that omits them.
In a Type 1 report the auditor assesses design only — does a control exist at a point in time that would meet CC5.1 if it operated. In a Type 2 report they also test operating effectiveness by sampling evidence from across the review period, typically 3 to 12 months. That difference is why Type 2 evidence has to be continuous rather than assembled the week before fieldwork.
A control that fails becomes an exception, which the auditor describes in the report along with management's response. Exceptions do not automatically make a report "failed" — a SOC 2 report is an opinion, not a pass/fail certificate — but a qualified opinion is what customers notice, so remediate and re-test before fieldwork closes where you can.
Yes — CC5.1 aligns with ISO 27001:2022 Annex A control(s) A.5.3. If you already run a certified ISMS, re-point that evidence rather than building a parallel set; the underlying control is the same and only the reporting format differs.