CMMC Audit Failures: The Most Common Findings (and How to Avoid Them)
Updated June 2026
Most CMMC Level 2 assessments don't fail because a contractor ignored security — they fail on the same handful of avoidable mistakes. Controls are scored all-or-nothing against every assessment objective, so "mostly implemented" earns zero, and an inflated readiness picture collapses the moment an assessor says "prove it." Here are the recurring findings and how to close each one before a C3PAO does.
1. Scoping errors (the #1 cause)
Getting the CUI boundary wrong — too broad, too narrow, or contradictory (an "out of scope" asset that actually provides a security function) — balloons the assessment or sinks it. Fix: classify every asset into the official scope categories and resolve contradictions before you do anything else.
2. MFA gaps on admin / local access — 3.5.3
MFA on user email but not on the admin console or server/hypervisor console; "privileged" never formally defined. Fix: enforce MFA for local and network privileged access and network non-privileged access, and document your privileged accounts. See 3.5.3 MFA evidence.
3. "FIPS-compliant" that isn't FIPS-validated — 3.13.11
Claiming AES-256 or "FIPS-capable" without a CMVP certificate or FIPS mode actually enabled. Fix: use validated modules in FIPS mode and produce the certificate numbers. See 3.13.11 FIPS cryptography.
4. Logs collected but not monitored — 3.3.1 vs 3.14.6
Audit logs exist (3.3.1) but nobody monitors them for attacks (3.14.6) — these are distinct controls. Fix: feed logs into a SIEM with real detection rules and evidence of alert triage, covering inbound and outbound traffic.
5. Over-permissioning — 3.1.1 / 3.1.2
Everyone an admin "to make things easier," no defined roles, no access reviews. Fix: define role-to-function mappings, enforce least privilege, and run access reviews. See 3.1.2 least privilege.
6. Coverage gaps in malicious-code protection — 3.14.2
EDR/AV on most endpoints but servers or a device subset uncovered, or the email gateway ignored. Fix: deploy protection at all designated locations and keep a dated coverage report proving no gaps.
7. Stale or undated evidence
A one-time screenshot with no date, or evidence that doesn't match the SSP narrative. Fix: keep evidence current within your freshness window and make every artifact traceable to the control it supports.
8. POA&M misuse
Assuming everything can be deferred. Certain higher-weighted practices can't be POA&M'd, you need at least 88 to use one, and encryption can only be POA&M'd if it's in use but not yet validated. Fix: confirm eligibility before relying on a POA&M.
9. An inflated SPRS score you can't defend
DCMA spot-checks SSPs and submitted SPRS scores. A number you can't back with evidence is a liability. Fix: score honestly, all-or-nothing, and keep the evidence behind every point. See how to calculate your SPRS score.
The pattern behind every finding
Almost every failure is an evidence failure: the control may be implemented, but it can't be demonstrated, defended, or matched to the SSP. The way to pass is to validate evidence the way an assessor will — before assessment day.
Want to know which of these would sink your assessment — before a C3PAO does? Book a DIBCAC-style readiness assessment →
Related: CMMC control evidence library · Calculate your SPRS score
Athena prepares organizations for CMMC Level 2; certification rests with C3PAOs/DIBCAC. Verify all control facts against NIST SP 800-171 Rev. 2, NIST SP 800-171A, and current CMMC rules.