NET-08.1: Sensitive / Regulated Data Enclave (Secure Zone)
Mechanisms exist to implement segmentation controls to restrict inbound and outbound connectivity for sensitive and/or regulated data enclaves (secure zones).
Renumbered: Formerly NET-06.3 in SCF 2025.4.
Code reused: In SCF 2025.4 and earlier, NET-08.1 was DMZ Networks. That control is now MON-25.
Control Question: Does the organization implement segmentation controls to restrict inbound and outbound connectivity for sensitive and/or regulated data enclaves (secure zones)?
General (5)
| Framework | Mapping Values |
|---|---|
| IEC 62443-2-1 2024 | NET 1.5 |
| IEC 62443-3-3 2013 | SR 5.1 RE 3 SR 5.2 RE 2 |
| NIST 800-171 R3 (source) | 03.13.01.b |
| NIST 800-171A R3 (source) | A.03.13.01.b |
| SWIFT CSF 2025 | 1.1 1.4 1.5 2.6 |
US (2)
| Framework | Mapping Values |
|---|---|
| USA Federal TSA SDP 2021-02F | III.B.1.c III.B.2.a |
| USA Federal TSA / DHS 1580/82-2022-01 | III.B.1.c |
EMEA (4)
| Framework | Mapping Values |
|---|---|
| EMEA Saudi Arabia CSCC-1 2019 | 2-3-1-4 2-4-1-6 2-4-1-7 |
| EMEA Saudi Arabia ECC-1 2018 | 5-1-3-1 5-1-3-2 |
| EMEA Saudi Arabia OTCC-1 2022 | 2-4-1-2 2-4-1-3 |
| EMEA Saudi Arabia SACS-002 2022 | VII.B.TPC-38 |
APAC (2)
| Framework | Mapping Values |
|---|---|
| APAC Japan ISMAP | 13.1.4.P |
| APAC New Zealand HISF Microsmall 2023 | HMS15 |
Americas (1)
| Framework | Mapping Values |
|---|---|
| Americas Canada ITSP-10-171 2025 | 03.13.01.B |
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
SCR-CMM Level 1 criteria definitions are not available for this control: ▪ A reasonable person would conclude this control requires a structured process. ▪ At this level of maturity, the "ad hoc" nature of performing a capability informally would indicate the intent of the control is not met due to a lack of consistency and formality.
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 implement segmentation controls to restrict inbound and outbound connectivity for sensitive/regulated data enclaves (secure zones).
Level 4 — Quantitatively Controlled
Utilize SCR-CMM Level 3 criteria definitions: ▪ There are no defined Level 4 criteria, since it is reasonable to assume a quantitatively-controlled process is not necessary to operationalize this control. ▪ While it may be possible to develop “metrics-driven” capabilities for this control, the criteria would be organization-specific to define.
Level 5 — Continuously Improving
Utilize SCR-CMM Level 3 or Level 4 (if available) criteria definitions: ▪ There are no defined Level 5 criteria, since it is reasonable to assume a continuously-improving process is not necessary to operationalize this control. ▪ Level 5 capabilities should be considered “world-class” where the control builds on Level 4 capabilities, but are continuously improving through Artificial Intelligence (AI) and/or Machine Learning (ML) technologies. ▪ While it may be possible to develop responsive capabilities for this control through the use of AI and/or ML technologies, the criteria would be organization-specific to define.
Assessment Objectives
- NET-08.1_A01 segmentation controls restrict inbound and outbound connectivity for sensitive / regulated data enclaves (secure zones).
Evidence Requirements
- E-NET-08 Internal Boundaries
-
Documented evidence of key internal boundaries.
Network Security
Technology Recommendations
Micro/Small
- Separate network/VLAN for systems holding sensitive data (e.g., accounting/HR system)
Small
- Firewall-enforced VLAN for sensitive/regulated data systems with restricted inbound/outbound rules
Medium
- Dedicated network segment for sensitive and/or regulated data systems
Large
- Secure enclave/zone for sensitive data
- Enhanced controls within the zone
Enterprise
- Enterprise secure data enclave with enhanced controls
- Data loss prevention at enclave boundary
- Microsegmentation