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11/07/2026 1:59 pm
TL;DR: CMMC 2.0 turns least privilege, deny-by-default networking, and explicit internal traffic control into audit-tested requirements for defense contractors handling FCI or CUI, according to Elisity. The practical shift is that segmentation now serves both compliance evidence and lateral movement containment, not just architecture hygiene.
NHIMG editorial — based on content published by Elisity: Aligning CMMC 2.0 with Network Security and Lateral Movement Prevention
By the numbers:
- 70% of successful breaches involve lateral movement techniques.
- 66% of manufacturers have experienced IoT security incidents.
- $4.88 million, with attackers dwelling in networks 280 days on average before detection.
Questions worth separating out
Q: How should security teams implement microsegmentation for CMMC 2.0?
A: Start by mapping CUI and FCI flows, then enforce identity-aware allow lists for the smallest practical set of users, devices, workloads, and services.
Q: Why does lateral movement matter so much in CMMC compliance?
A: Because CMMC is trying to stop a single foothold from becoming broad internal access.
Q: What do organisations get wrong about segmentation in Zero Trust programmes?
A: They often treat segmentation as a network design task instead of an access governance task.
Practitioner guidance
- Map CMMC controls to identity-aware traffic decisions Translate AC and SC requirements into explicit allow rules for users, devices, workloads, and segments.
- Separate CUI flows from general enterprise paths Create dedicated segments for CUI repositories, administrative interfaces, and critical production services.
- Use policy logs as compliance artefacts Retain enforcement logs, policy changes, and exception approvals so you can prove who could talk to what at any point in time.
What's in the full article
Elisity's full post covers the implementation detail this post intentionally leaves for the source:
- Step-by-step control mapping from CMMC Level 2 requirements to AC, SC, AU, and IR outcomes.
- Operational examples for OT, IoT, and manufacturing environments where agents cannot be deployed everywhere.
- Policy simulation and enforcement sequencing for teams that need to avoid downtime while deploying segmentation.
- Readiness checklist detail for proving deny-by-default, logging, and exception handling during an assessment.
👉 Read Elisity's analysis of CMMC 2.0 and identity-based lateral movement prevention →
CMMC 2.0 and lateral movement prevention: are your controls keeping up?
Explore further
11/07/2026 2:10 pm
Identity-based segmentation is now a governance control, not a network preference. CMMC 2.0 forces contractors to prove that internal traffic is constrained by least privilege and explicit policy, which moves segmentation into the identity governance conversation. That matters because reachability is itself an access decision, and access decisions are what IAM and PAM disciplines are supposed to govern. Practitioners should treat segmentation policy as part of access design, not a downstream network tweak.
A few things that frame the scale:
- 88.5% of organisations acknowledge that their non-human IAM practices lag behind or are merely on par with their human identity and access management efforts, according to The 2024 Non-Human Identity Security Report.
- Only 5.7% of organisations have full visibility into their service accounts, according to the Ultimate Guide to NHIs.
A question worth separating out:
Q: Who is accountable for proving CMMC network controls actually work?
A: Accountability usually sits with the security architect, compliance lead, and the team that owns enforcement policy, not just the network team. They must show that least privilege, deny-by-default, and logging are operational, not theoretical. If exceptions exist, they need ownership, expiry, and review evidence.
👉 Read our full editorial: CMMC 2.0 makes identity-based segmentation a compliance issue
