NET-40: End-User Messaging Technologies
Mechanisms exist to prohibit the transmission of unprotected sensitive and/or regulated data by end-user messaging technologies.
Renumbered: Formerly NET-12.2 in SCF 2025.4.
Control Question: Does the organization prohibit the transmission of unprotected sensitive and/or regulated data by end-user messaging technologies?
General (7)
| Framework | Mapping Values |
|---|---|
| AICPA TSC 2017:2022 (used for SOC 2) (source) | CC6.7-POF1 |
| IEC 62443-2-1 2024 | NET 1.8 |
| PCI DSS 4.0.1 (source) | 4.2.2 |
| PCI DSS 4.0.1 SAQ A-EP (source) | 4.2.2 |
| PCI DSS 4.0.1 SAQ C (source) | 4.2.2 |
| PCI DSS 4.0.1 SAQ D Merchant (source) | 4.2.2 |
| PCI DSS 4.0.1 SAQ D Service Provider (source) | 4.2.2 |
US (1)
| Framework | Mapping Values |
|---|---|
| USA Federal FFIEC ITEH 2016 | II.C.13.b |
APAC (1)
| Framework | Mapping Values |
|---|---|
| APAC India RBI Digital Payments 2021 | 32.0 |
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. ▪ Network communications containing sensitive/regulated data are protected using a cryptographic mechanism to prevent unauthorized disclosure of information while in transit (e.g., SSH, TLS and VPN).
Level 2 — Planned & Tracked
Network Security (NET) capabilities are requirements-driven, but are not standardized across the entity (e.g., local/regional level consistency). 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. ▪ Standardized Operating Procedures (SOP) associated with NET domain capabilities are documented and maintained by process owners. ▪ IT and/or cybersecurity personnel work with business stakeholders and process owners to appropriately scope and reasonably implement cybersecurity and data protection controls associated with NET domain capabilities to address applicable statutory, regulatory and/or contractual requirements for Technology Assets, Applications, Services and/or Data (TAASD). ▪ Network security-related controls are primarily administrative and preventative in nature (e.g., policies, standards and procedures & guidelines). ▪ Network security management may be a defined function (e.g., team or department) or assigned as an additional duty to existing IT and/or cybersecurity personnel. ▪ IT personnel define secure networking practices to protect the Confidentiality, Integrity, Availability and Safety (CIAS) of the organization's TAASD. ▪ Secure Baseline Configurations (SBC) enforce the principles of least privileges and least functionality for boundary protection technologies.
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 prohibit the transmission of unprotected sensitive/regulated data by end-user messaging technologies.
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-40_A01 the transmission of unprotected sensitive / regulated data by end-user messaging technologies is prohibited through administrative and/or technical means.
Evidence Requirements
- E-NET-12 Email Security Configuration
-
Documented evidence of email domain reputation protections (DMARC, SPF, ARC) and phishing / spam protection configurations.
Network Security
Technology Recommendations
Micro/Small
- Acceptable Use Policy (AUP)
- Data Loss Prevention (DLP)
Small
- Acceptable Use Policy (AUP)
- Data Loss Prevention (DLP)
Medium
- Acceptable Use Policy (AUP)
- Data Loss Prevention (DLP)
Large
- Acceptable Use Policy (AUP)
- Data Loss Prevention (DLP)
Enterprise
- Acceptable Use Policy (AUP)
- Data Loss Prevention (DLP)