Why Cyber Diligence Should Score Against NIST, ISO and CIS

The problem with a proprietary score

Advisory firms frequently market a branded assessment methodology with its own scoring scale. It photographs well in a pitch deck. It creates two practical problems in a live deal.

First, nobody downstream can act on it. The lender's advisor, the cyber insurer, the target's future auditor, and the acquirer's own security team all work in established vocabularies. A proprietary score has to be translated before any of them can use it, and translation introduces both delay and error.

Second, it cannot be verified. When a finding is mapped to a recognized control, anyone can check the work and later confirm whether the gap was closed. A number on a private scale is a matter of trust in the adviser, which is precisely the thing a first-time client has least of.

What anchoring to standards provides

Assessing against the NIST Cybersecurity Framework, ISO/IEC 27001, and the CIS Critical Security Controls gives a transaction three things it needs.

• Portability. Findings travel to insurers, lenders, auditors, and the portfolio company's own roadmap without rework.
• Verifiability. Closure can be evidenced against a named control, which matters at the 100-day mark and again at exit.
• Comparability. A sponsor assessing several portfolio companies gets scores that mean the same thing across all of them.

Where translation belongs

None of this argues for handing an investment committee a control-by-control matrix. Committees need risk, cost, timing, ownership, and deal impact.

The right structure is a framework-anchored foundation with a deal-language layer on top: every finding traceable to a recognized control, and every material finding expressed as what it costs, how long it takes, who owns it, and whether it belongs before close, at Day 1, or in the 100-day plan. The standards make the work checkable. The translation makes it usable.