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A SASE firewall helps apply network security controls to workers wherever they connect, but it is only one part of a broader architecture. Secure access service edge (SASE) combines networking and security services so organizations can enforce policies for employees at home, in an office, or on the road. Its value depends on which traffic and applications are covered, what identity and device signals inform decisions, and how the system is deployed.
What is a SASE firewall?
There is no single, standalone product definition implied by the term. A SASE firewall generally means a firewall capability delivered as part of a SASE service, rather than an appliance that alone secures remote work. NIST describes SASE as networking and security delivered as a service, with capabilities that can include software-defined wide-area networking (SD-WAN), a secure web gateway (SWG), a cloud access security broker (CASB), a next-generation firewall (NGFW), and zero trust network access (ZTNA). NIST says the architecture can serve branch offices, remote workers, and on-premises users, with access decisions informed by identity, real-time context, and security and compliance policies. NIST SP 1800-35 initial public draft
The security service edge (SSE) label refers to the security portion of SASE. In Cloudflare’s explanation of SSE, its core capabilities are ZTNA, SWG, and CASB; firewall as a service (FWaaS) and remote browser isolation (RBI) are often included as well. The full SASE model pairs security services with edge WAN services. These terms describe related architectures, not a guarantee that every provider bundles the same features.
How SASE security controls help distributed teams
The practical change is that policies can follow users and traffic beyond the traditional office perimeter. The controls below address different paths and risks; they are most useful when their coverage and rules are deliberately configured.
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Firewall inspection beyond the office
A cloud-delivered firewall can filter and inspect traffic routed through the service, including traffic from users outside the corporate network. That can extend a common set of rules to remote connections, but only for traffic actually sent through the service and subject to its policies.
ZTNA for private applications
ZTNA can grant a user access to specific private applications based on identity, device signals, and policy rather than giving every remote worker broad access to the internal network. This can narrow the reach of a connection, though the result depends on how applications, users, and devices are defined and managed.
SWG for Internet-bound traffic
A secure web gateway mediates traffic headed to the public Internet. It can filter destinations and enforce acceptable-use or security rules for users away from the office, provided that their web traffic is routed through the gateway.
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CASB and data controls
A CASB can apply policy to cloud application use, while data loss prevention (DLP) controls can identify or restrict sensitive data flows. Together, these capabilities can help organizations govern approved and unapproved cloud services, subject to the applications, data, and inspection paths covered by their configuration.
Remote browser isolation
In an architecture that offers RBI, browser activity is executed away from the user’s local endpoint. This can reduce the endpoint’s direct exposure to web content, but it should not be treated as a guarantee against all malware or other attacks.
One example of how these capabilities can be connected appears in Cloudflare’s SASE reference architecture. It describes routing traffic for application access, Internet filtering, browser isolation, DLP inspection, and visibility into non-approved applications. Its connection options include endpoint software connectors, IPsec or GRE tunnels from network equipment, and direct network connections in supported locations. These are examples from one provider’s architecture, not universal SASE requirements.
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How SASE differs from SSE
| Term | What it describes | Typical capabilities in the cited explanation |
|---|---|---|
| SASE | A broader architecture combining security services with edge WAN networking. | Networking such as SD-WAN, plus security capabilities such as NGFW, ZTNA, SWG, and CASB, as described by NIST. |
| SSE | The security-services portion of SASE. | ZTNA, SWG, and CASB; FWaaS and RBI are often included in Cloudflare’s explanation. |
Providers may use product labels and bundles differently, so compare the actual capabilities and traffic coverage rather than relying on the acronym alone.
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There is no universal rollout recipe: NIST cautions that zero trust architecture (ZTA) implementations are organization-specific. In a 2025 overview, NIST reported 19 example ZTA architectures built with commercial off-the-shelf technologies, involving 24 industry collaborators. NIST computer scientist and co-author Alper Kerman noted, “Also, everyone’s network environments are different, so every ZTA is a custom build. It’s not always easy to find ZTA experts who can get you there.” NIST, “NIST Offers 19 Ways to Build Zero Trust Architectures,” June 11, 2025
Use these questions to evaluate whether a proposed design fits the organization:
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- Blocks zero-day threats and ransomware with Capture ATP sandboxing enhanced by RTDMI, plus IPS and anti-malware scanning for layered protection.
- Eliminates the need for separate access points in smaller spaces thanks to built-in high-speed wireless that is simple to deploy and manage.
- Supports VPN, SD-WAN, and TLS 1.3 decryption to secure hybrid cloud access and remote workers while maintaining usability and performance.
- Delivers gigabit performance with up to 750,000 concurrent connections to handle growth in users, devices, and SaaS applications.
- Traffic coverage: Which employee, office, and application traffic is routed through the service, and what remains outside it?
- Private and legacy applications: How will users reach private apps, and are required legacy protocols supported?
- Policy signals: Which identity and device attributes are used to make access decisions, and how are policies maintained?
- Inspection and data controls: Which web, cloud-app, and data flows can be inspected or governed?
- Real-world user experience: How do latency and reliability perform in the locations where employees actually work?
- Migration and operations: What work is needed to move users and applications, and who will manage rules, exceptions, and troubleshooting?
The cited architecture materials describe design options, but do not establish independent comparative performance results or prices. Assess performance in the organization’s own locations and workflows rather than assuming a particular latency or savings outcome.
How to read vendor claims and customer examples
Cloudflare’s remote-work security page describes a customer example in which Bouvet uses DNS filtering, SWG inspection, and RBI across 2,300 employees and 17 offices in Norway and Sweden. Those figures describe Cloudflare’s customer story, not an independent evaluation of security outcomes. The page also makes Cloudflare-specific claims that its network is approximately 50 ms from about 95% of Internet users and that it sees approximately 61 trillion DNS queries per day. These are vendor-reported metrics, not universal measures of service performance or industry activity.
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