FedRAMP 20x: Review a Scanner's Security Tradeoffs Before Buying

Before buying a vulnerability scanner, ask the vendor to show what operating it would change in your environment. Start with requested privileges, network paths, and protective settings, then compare those changes with the detection coverage you expect.

Use this FedRAMP 20x scanner security tradeoffs review to prepare that discussion. The purchasing checklist and worked example below are Boundera's implementation advice; they are not FedRAMP-prescribed test cases.

Start with the published rule and its dates

FedRAMP's VDR-CSO-MSP, Maintain Security, says providers SHOULD NOT reduce the security of information resources to enable vulnerability scanning, detection, or assessment. The current 20x General Provider Responsibilities scope lists Classes B, C, and D on both the Program and Agency paths. Read the VDR rules.

As checked on October 22, 2026, the published VDR dates are July 4, 2026 for optional adoption, December 7, 2026 for obtaining initial certification and maintaining ongoing certification, and March 7, 2027 for the end of the grace period. The December and March dates are still ahead of this article's publication date.

Keep the force of SHOULD NOT intact. FedRAMP's definition allows valid circumstances where the action may be acceptable or useful, provided its implications are understood and carefully weighed. It also requires parties to explain how they handle such rules in their security documentation. Read the definition.

For your purchasing review, examine the security effect of each requested change. Do not treat the presence of a permission request, by itself, as your conclusion that security would be weakened.

Ask for a concrete operating configuration

Ask the vendor and your engineering owner to complete the following comparison for the configuration you would actually deploy. Record unknowns explicitly and request a demonstration before treating a sales answer as verified.

Use a separate row for installation access and recurring operation. Ask whether a privilege is temporary, persistent, or used only for a particular detection function. Assign an owner to verify the answer against the vendor's actual configuration.

For every proposed change, write down the security question it raises and the evidence that would resolve that question. For example, ask whether the requested network path can be limited to named targets and a defined execution period. Treat that as a candidate configuration to test, not an assumption that narrower access will retain the same coverage.

Compare security effects with detection coverage

Ask the vendor to demonstrate at least two feasible configurations when there is a material tradeoff: the proposed default and a narrower alternative. Compare both the observed security effects and the checks each configuration successfully performs. Include errors, skipped checks, inaccessible resources, and manual follow-up in the comparison.

Retain the detection obligation in the decision. VDR-CSO-DET requires systematic, persistent, and prompt vulnerability discovery and identification throughout the cloud service offering using appropriate techniques; its examples extend beyond scanning to capabilities such as threat intelligence and incident response. It also includes persistent verification and validation that resources and processes operate as intended and documented for FedRAMP Practices. See Vulnerability Detection.

Our recommendation is to test a narrower configuration against an explicit coverage list. Where it leaves a gap, ask how another suitable technique would address that gap and how your team would verify the result. Do not mark a missing observation as a successful security check.

Work through a hypothetical network-access request

Suppose a scanner vendor proposes a standing network path to an entire test segment. For this purchasing exercise, ask it to demonstrate a second configuration limited to selected targets during an agreed test period.

Record which checks ran in each configuration, what each check observed, and which checks could not complete. Ask your engineering owner to inspect the resulting network settings and explain the security effect of each option. Keep the demonstration isolated from production until your normal change approval process permits otherwise.

If the narrower configuration misses a needed observation, request a specific alternative and test its output. If neither configuration gives your team an acceptable combination of security effects and useful coverage, keep the purchasing decision open. This example recommends an evaluation method; it does not endorse a scanner architecture or determine that either configuration meets FedRAMP rules.

Write the decision so another reviewer can follow it

For your internal purchasing record, retain the proposed configuration, the change being evaluated, the evidence observed, the alternatives tested, and the reasons for the selected option. Add the remaining coverage gaps, their owners, and the conditions that would trigger another review.

These suggested fields are a working format, not a named FedRAMP artifact. Keep the formal documentation obligation from the SHOULD NOT definition in view when deciding where the explanation belongs in your security documentation.

A useful purchasing review should end with a concrete next step: accept the demonstrated configuration through your normal approval process, request a revised configuration, or defer the purchase while specific questions remain unanswered. Ask for evidence that supports that next step, and preserve the unresolved questions alongside it.

For a separate discussion of sampling, see our vulnerability sampling coverage guide.

Frequently asked questions

Is Maintain Security an absolute ban on security tradeoffs?

VDR-CSO-MSP uses SHOULD NOT. FedRAMP's definition permits valid circumstances for the action after careful consideration of its implications and requires an explanation of the handling decision in security documentation. Evaluate the specific facts of your configuration with those qualifications in view.

What should we request before a scanner demonstration?

Request the proposed privileges, network paths, protective-setting changes, detection coverage, and removal procedure. Use the demonstration to test those answers and record missing observations. This is our purchasing advice, not a FedRAMP test script.

What if the narrower configuration misses important checks?

Keep the coverage gap visible. Ask the vendor to demonstrate another suitable technique or configuration, assign an owner to evaluate it, and leave the purchase unresolved until your team has enough evidence to make its decision.