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SASE is a cloud architecture that combines network and security capabilities for enterprise access. It is a plausible response to distributed users, cloud services, and changing enterprise networks—not a guaranteed security outcome or a forecast that every organization will adopt it. CISA and partner agencies recommend evaluating SASE alongside other modern approaches, while NIST describes it as one option in a wider zero-trust landscape.
What is SASE?
Secure Access Service Edge (SASE) brings networking and security capabilities together as services, commonly delivered through a cloud architecture. CISA and partner agencies identify these capabilities in their June 2024 guidance:
- SD-WAN: software-defined wide area networking, which connects sites and users across networks.
- Secure web gateway (SWG): security controls for web traffic.
- Cloud access security broker (CASB): controls for use of cloud services.
- Next-generation firewall (NGFW): network traffic inspection and policy enforcement.
- Zero-trust network access (ZTNA): controlled access to private applications based on identity and other access conditions.
The exact functions and how they are integrated vary by implementation. SASE describes an architectural approach, not a single product or a guarantee that its components share one policy engine or management interface.
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Why has SASE become relevant?
Enterprise networks increasingly need to serve users, applications, and infrastructure spread across locations and cloud environments. NIST’s SP 800-215, published in November 2022, discusses the effects of access to multiple cloud services, geographically distributed enterprise IT, and the move toward microservices on the network landscape.
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A design centered on a fixed corporate perimeter can be a poor fit when users and applications are distributed. SASE is one way to bring network connectivity and security services into a model intended to support that distribution. Its relevance depends on whether its capabilities address an organization’s actual traffic flows, applications, and operational needs.
How does SASE relate to SSE and zero trust?
Security service edge (SSE) refers to a convergence of security services. SASE is broader: it combines networking with security as service capabilities. In practical terms, an organization evaluating SSE is primarily considering security functions; a SASE evaluation also considers network services such as SD-WAN.
Zero trust is a security approach, not a synonym for SASE. SASE can support a zero-trust architecture, including access controls for private applications, but adopting SASE alone does not establish that an organization has implemented zero trust. NIST’s SP 1800-35, published June 10, 2025, documents 19 example zero-trust implementations, including SASE approaches. They are examples to inform implementation, not a prescription that every organization use the same architecture.
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How does SASE differ from a VPN?
A VPN is a way to establish a network connection, often for remote access. SASE is a broader architecture that can combine networking and security services, including ZTNA and other controls. The terms are not interchangeable: a SASE design may change how remote access is controlled, but the architecture encompasses more than a VPN connection.
CISA and partner agencies describe risks in traditional remote-access and VPN deployments, including vulnerabilities and misconfiguration. Their June 18, 2024 alert urges organizations to consider Zero Trust, SSE, and SASE approaches for greater visibility into network activity. This is guidance to evaluate options, not evidence that SASE prevents breaches or eliminates the need to configure and operate access controls securely.
What should you look for in a SASE solution?
Start with the access and network problems the organization needs to solve, then compare implementations against those requirements. Official guidance supports evaluating these dimensions; it does not provide a vendor ranking or establish comparative performance.
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- Security functions: Identify which of SWG, CASB, NGFW, and ZTNA capabilities are included, and whether policy and management are meaningfully integrated.
- Network scope: Check whether SD-WAN and branch connectivity are needed, and how the service fits alongside existing network infrastructure.
- Identity integration: Determine how the design uses identity and enforces access to private applications.
- Visibility: Assess what administrators can see about users, devices, applications, and network activity.
- Environment fit: Map requirements across cloud services, on-premises applications, branches, and remote users.
- Operations and migration: Account for deployment complexity, migration work, integration with existing controls, and ongoing administration.
NIST’s E2B5 implementation documentation illustrates one SASE-oriented zero-trust build using specific services. Treat it as an example of integration choices, not a required stack, endorsement, or assurance of current product terms.
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Is SASE really the future of network security?
The evidence supports calling SASE a relevant approach to evaluate, not declaring it the inevitable future. CISA’s 2024 guidance addresses the challenges of modern network access and recommends considering SASE, SSE, and zero-trust approaches. NIST’s work likewise places SASE among multiple implementation possibilities.
Whether SASE makes sense depends on the organization’s topology, application access needs, identity controls, existing investments, and ability to operate the architecture. A careful evaluation should compare those requirements with the services and integration an implementation actually provides, rather than treating the SASE label as proof of security or future-proofing.
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