Security teams should choose ZTNA when they need resource specific access, strong least privilege enforcement, and better cloud alignment. VPNs still fit smaller environments with modest remote access needs, but they create broader network exposure once a user is authenticated. The practical decision is to match the access model to the risk profile, application mix, and scale of remote users.
How to choose the right remote access model
The real decision is not which control is more modern, but which access boundary you want to enforce. ZTNA is better when teams need per-application access, tighter segmentation, and a model that scales with cloud and hybrid environments. VPNs are simpler to stand up and can still be appropriate where the remote access footprint is small, stable, and centrally managed.
ZTNA changes the trust model by making access decisions at the resource or application layer rather than opening a broad network tunnel. That reduces the blast radius of a compromised endpoint or account, because authentication alone does not grant lateral reach across the internal network. VPNs remain useful where legacy systems, flat network dependencies, or a limited user base make a network tunnel operationally easier than redesigning access.
For teams comparing the two, the practical question is whether remote users need access to a network, or only to a small set of services. If the latter is true, ZTNA usually creates a better security posture because it supports least privilege more naturally and avoids exposing internal network topology to every connected user.
Remote access is also a lifecycle issue. As the number of users, devices, and applications grows, the operational burden of VPN segmentation, split tunnelling policy, and broad network entitlements tends to rise faster than the burden of application-scoped access policies. That is why ZTNA often becomes the better fit at scale, even when a VPN looks adequate in a smaller environment.
What changes in the risk profile
The main security difference is blast radius. A VPN can be well configured and still create wider internal exposure once a user is inside the tunnel, while ZTNA constrains access to explicitly approved resources. That matters most when the remote workforce includes contractors, unmanaged devices, or users who only need a narrow slice of internal applications.
In practice, teams should treat VPNs as a broader network-access control and ZTNA as a more granular application-access control. The first is easier when the environment is network-centric; the second is stronger when the environment is service-centric and identity-aware. Both can be secure, but they fail in different ways if the surrounding policy, device posture, or credential handling is weak.
For organisations already moving toward cloud-hosted applications and distributed work, ZTNA usually reduces accidental exposure because access is tied to the target service rather than the whole subnet. For environments with many legacy protocols, internal tools, or remote administration needs, VPNs may still be the practical bridge until those services can be reworked.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, NIST CSF 2.0 and OWASP ASVS set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-6 — Least Privilege | ZTNA vs VPN hinges on limiting user reach to only needed resources. |
| AC-17 — Remote Access | This question is specifically about selecting and governing remote access methods. | |
| Recommendation — Apply AC-6 to restrict remote users to only the resources their role requires. Use AC-17 to define how remote access is approved, authenticated, and constrained. | ||
| NIST CSF 2.0 | PR.AA-05 — Identity Management, Authentication and Access Control | Both ZTNA and VPN decisions depend on how access is authenticated and enforced. |
| PR.AA-02 — Identity Management | Remote access models depend on consistent identity assignment and access governance. | |
| Recommendation — Implement PR.AA-05 to bind remote access to verified identities and limited entitlements. Use PR.AA-02 to maintain accurate identity records for remote access decisions. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | Remote access choice must align with access control policy and enforcement. |
| Recommendation — Define and enforce access control rules for remote connectivity and resource scope. | ||
| OWASP ASVS | V8 — Authorization | ZTNA maps to per-resource authorization rather than broad network reach. |
| Recommendation — Verify that remote sessions receive only the authorizations needed for each protected service. | ||
Practitioner Guidance
What to verify: Start by mapping remote access to actual application need, not to network reach. If most users only need a handful of named services, favour ZTNA; if users genuinely require broad internal network reach for legacy administration or tightly coupled systems, a VPN may remain the lower-friction choice.
Decision rule: Use ZTNA when least privilege, user-by-user scoping, and cloud-friendly access boundaries are the priority. Use VPNs when the environment is still network-dependent and the team can enforce strong segmentation, device controls, and session governance around the tunnel.
Common mistake: Treating a VPN as a complete remote access strategy after authentication is the trap. Authentication proves who connected, but it does not by itself limit what that user can reach once connected, which is why policy design matters as much as the connection method.
Practitioner takeaway: The best choice is the one that matches the access model to the architecture you actually run, because the right answer changes when the business needs broad network reach rather than narrow service access.
Related resources from NHI Mgmt Group
- How should security teams decide whether JIT access is safe for non-human identities?
- How should security teams decide between leased credentials and remote identities for SSH and Kubernetes access?
- How should security teams decide between a VPN-style overlay and privileged access management?
- How should security teams decide between SASE and CASB for cloud access governance?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 23, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
