FedRAMP 20x False Positives: Document the Vulnerability Decision

FedRAMP 20x false positive vulnerabilities need a precise explanation of the resource's actual state. For Class C analysts, an unfavorable scanner result, low exploitability and successful remediation are different questions. Record why the detection does or does not describe a vulnerability that was present.

The decision should be understandable from the evidence, not just from a suppression label in a scanner console.

Use the false-positive definition with all its conditions

FRD-FPV defines a false positive as a detected vulnerability not actually present in an exploitable state in the resource. Its notes include vulnerable code that exists but is not loaded, running or otherwise in the operating state needed for exploitation. The definition also says the classification applies only if the vulnerability is not and was not present: a remediated or fully mitigated vulnerability cannot also be a false positive. FedRAMP Definitions

Read the present and historical conditions together. Finding that software is not running today does not, by itself, establish that the vulnerability was never present. Investigate the state relevant to the detection and the changes made afterward.

For example, if an engineering change removed the weakness after it was detected, evaluate the treatment state using the appropriate definition. Do not rewrite that sequence as a false positive merely because the latest result is clean.

Keep false-positive review separate from exploitability

For Class C, VER-EVA-EFP says providers SHOULD evaluate detected vulnerabilities in the offering's context to determine whether they are false positives. VER-EVA-ELX separately says providers MUST evaluate whether detected vulnerabilities are likely exploitable. Preserve the different force and purpose of those provisions. FedRAMP Vulnerability Evaluation and Reporting

FRD-LEV's likely-exploitability definition includes the vulnerability not being fully mitigated, reachability by a likely threat actor, and a likely adverse impact from exploitation by an actor with knowledge of the vulnerability. That is a distinct test from whether the vulnerability is not and was not present under FRD-FPV. FedRAMP Definitions

Use the mitigation and remediation guide to keep treatment states accurate, and the internet-reachability guide for the separate payload-path evaluation.

Preserve the evidence behind the decision

A practical working record can include the resource identity, original detection, relevant software and runtime state, historical evidence, evaluation rationale and owner. These are editorial suggestions for making the decision inspectable.

Ask the reviewer to connect the evidence to the specific condition in the definition. A package version, runtime observation or configuration record may answer part of the question; explain what it establishes and what it does not. Preserve uncertainty if the historical state cannot yet be established.

If your tooling suppresses repeated detections, retain a route back to the rationale and supporting evidence. The suppression action should not become the only surviving record of the analysis.

Revisit decisions when the relevant state changes

As an engineering practice, tie reconsideration to changes that affect the basis of the decision, such as a component becoming active or a different execution path being used. This is a suggested review trigger, not an additional official review interval.

The VER page lists optional adoption on July 4, 2026, initial and ongoing certification adoption on December 7, 2026, and a grace-period end of March 7, 2027. Keep the applicable source version with your evaluation process.

A useful false-positive record explains why the definition fits, preserves the evidence of the relevant state and makes a later change easy to reassess.