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NET-12: Software Defined Networking (SDN)

NET 5 — Medium Protect

Automated mechanisms exist to enable dynamic, policy-driven network segmentation, access controls and traffic management with a Software Defined Networking (SDN) architecture.

Renumbered: Formerly NET-06.7 in SCF 2025.4.

Code reused: In SCF 2025.4 and earlier, NET-12 was Safeguarding Data Over Open Networks. That control is now NET-37.

Control Question: Does the organization use automated mechanisms to enable dynamic, policy-driven network segmentation, access controls and traffic management with a Software Defined Networking (SDN) architecture?

US (1)
Framework Mapping Values
USA Federal DoD Zero Trust Execution Roadmap v1.1 3.4.7 5.2.1 5.2.2 5.4.2
EMEA (1)
Framework Mapping Values
EMEA Germany C5 2026 PSS-10.01B PSS-10.02B

Capability Maturity Model

Level 0 — Not Performed

Practices are non-existent, based on the inability to demonstrate an implemented and operational capability. A reasonable person would conclude the control is not being performed.

Level 1 — Performed Informally

Network Security (NET) domain capabilities are ad hoc and inconsistent. Capability criteria associated with this control may include: ▪ Policies, standards & procedures associated with NET domain capabilities provide limited coverage due to the depth and breadth of the existing documentation. ▪ Network security-related activities are decentralized (e.g., a localized/regionalized function) and uses non-standardized methods to implement secure, resilient and compliant practices.

Level 2 — Planned & Tracked

SCR-CMM Level 2 criteria definitions are not available for this control: ▪ A reasonable person would conclude a well-defined and standardized process is required. ▪ At this level of maturity, the “requirements-driven” nature of performing the control is focused on a localized and/or regionalized implementation, not uniform and consistent across the organization. ▪ Requirements are narrowly scoped for applicability and are primarily derived from compliance obligations (e.g., laws, regulations and contracts).

Level 3 — Well Defined

Network Security (NET) capabilities are standardized across the entity for applicability to People, Processes, Technologies, Data and/or Facilities (PPTDF) to ensure consistency for Technology Assets, Applications, Services and/or Data (TAASD). Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Policies and standards associated with NET domain capabilities are formally documented and centrally-managed by the entity's Governance, Risk & Compliance (GRC) team, or similar function. ▪ Standardized Operating Procedures (SOP) associated with NET domain capabilities are well-documented and kept current by process owners. ▪ A network security management team, or similar function, is appropriately staffed and supported to implement and maintain NET domain capabilities. ▪ Technology is leveraged to enhance the efficiency and accuracy of network security operations (e.g., network management solution and log aggregator). ▪ The entity's Governance, Risk & Compliance (GRC) team, or similar function, works with business stakeholders and process owners to appropriately scope and reasonably implement cybersecurity and data protection controls associated with NET domain capabilities to address Minimum Compliance Requirements (MCR) (e.g., applicable statutory, regulatory and/or contractual requirements) and Discretionary Security Requirements (DSR) (e.g., entity-required controls). ▪ Secure Baseline Configurations (SBC) enforce the principles of least privileges and least functionality for boundary protection technologies. ▪ An implemented and operational capability exists to automatically enable dynamic, policy-driven network segmentation, access controls and traffic management with a Software Defined Networking (SDN) architecture.

Level 4 — Quantitatively Controlled

Network Security (NET) capabilities, in addition to being standardized across the entity and centrally managed to ensure consistency across Technology Assets, Applications, Services and/or Data (TAASD), efforts are metrics driven to provide sufficient insight for decision makers to predict optimal performance, ensure continued operations and/or identify areas for improvement. Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Applicable SCR-CMM Level 3 (Well Defined) capabilities are implemented and operational. ▪ Metrics reporting includes quantitative analysis of Key Performance Indicators (KPIs). ▪ Metrics reporting includes quantitative analysis of Key Risk Indicators (KRIs). ▪ Scope of metrics, KPIs and KRIs covers organization-wide cybersecurity and data protection controls, including functions performed by third-parties. ▪ Organizational leadership maintains a formal process to objectively review and respond to metrics, KPIs and KRIs (e.g., monthly or quarterly review). ▪ Based on metrics analysis, process improvement recommendations are submitted for review and are handled in accordance with change control processes. ▪ Business and technical stakeholders are involved in reviewing and approving proposed changes to evolve capabilities.

Level 5 — Continuously Improving

Network Security (NET) capabilities, in addition to being standardized across the entity and centrally managed to ensure consistency across Technology Assets, Applications, Services and/or Data (TAASD), efforts are metrics driven to provide sufficient insight for decision makers to predict optimal performance, ensure continued operations and/or identify areas for improvement. Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Applicable SCR-CMM Level 3 (Well Defined) capabilities are implemented and operational. ▪ Based on predictive analysis, process improvements are implemented according to “continuous improvement” practices that affect process changes. ▪ Stakeholders make time-sensitive decisions to support operational efficiency, which may include automated remediation actions via Artificial Intelligence (AI) or Machine Learning (ML) technologies.

Assessment Objectives

  1. NET-12_A01 automated mechanisms implement dynamic, policy-driven network segmentation.
  2. NET-12_A02 automated mechanisms implement dynamic, policy-driven access controls.
  3. NET-12_A03 automated mechanisms implement dynamic, policy-driven network traffic management.

Technology Recommendations

Micro/Small

  • Note: Typically not required at this size

Small

  • Note: Typically not required at this size; cloud-native network policies (security groups) where applicable

Medium

  • Cloud-native SDN capabilities (e.g., AWS VPC, Azure Virtual Network) with policy-driven segmentation
  • SDN planning for on-premises networks

Large

  • Software-defined networking (SDN) evaluation and planning

Enterprise

  • Enterprise SDN platform (e.g., Cisco ACI, VMware NSX)
  • Centralized network policy management
  • Automated network provisioning

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