Teams often treat VPNs as proof that a connection is trustworthy. In reality, a VPN mainly hides the origin network and can improve privacy, but it does not confirm that the device, user, or workload behind it is legitimate. It should be paired with authentication, posture checks, and session monitoring.
Why This Matters for Security Teams
VPNs are often treated as a security boundary when they are really a transport control. They can encrypt traffic in transit and mask the source network, but they do not prove that the endpoint is healthy, the user is authorized for the session, or the workload is trustworthy. That misconception becomes dangerous in environments that already struggle with identity sprawl and weak secret hygiene, which is why NHI Management Group highlights how Ultimate Guide to NHIs shows many organisations still expose NHIs to third parties and keep long-lived credentials in risky places.
Current guidance from NIST Cybersecurity Framework 2.0 pushes teams toward continuous risk management, not network trust by location. That matters because a VPN can still carry compromised devices, over-privileged service accounts, and stolen tokens straight into internal systems. In the NHI domain, the problem is often not the tunnel itself but the false sense of trust that comes with it. In practice, many security teams encounter VPN abuse only after a credential is reused or a session is already pivoting laterally, rather than through intentional monitoring.
How It Works in Practice
A safer model is to treat VPN access as one signal among many, not the deciding factor. Security teams should authenticate the user or workload, validate device posture, and evaluate session risk before and during access. For NHIs, that means the VPN must never be the control that grants authority to an API key, service account, or automation token. Instead, the identity behind the connection should be bound to short-lived credentials, least privilege, and explicit approvals for high-risk actions.
This is where Ultimate Guide to NHIs is especially relevant: organisations often have broad NHI exposure and poor rotation discipline, which makes a VPN a weak compensating control if secrets are already long-lived. A stronger pattern is:
- Require multi-factor authentication for interactive users and separate workload identity for machine access.
- Use posture checks for managed devices before tunnel establishment.
- Issue just-in-time access or short-lived tokens rather than permanent network trust.
- Log and inspect session behaviour, including unusual data movement or lateral access.
- Revoke access automatically when the task ends or the risk score changes.
For policy design, teams should map controls to the NIST Cybersecurity Framework 2.0 functions of Protect, Detect, and Respond so the VPN becomes a conduit with guardrails, not a trust decision. These controls tend to break down when legacy applications only accept network-based allowlists because the VPN then becomes the de facto authorization layer.
Common Variations and Edge Cases
Tighter VPN enforcement often increases operational friction, requiring organisations to balance user convenience against stronger verification. That tradeoff is especially visible in vendor access, contractor support, and hybrid work, where teams may want to preserve connectivity while still limiting blast radius. Best practice is evolving, and there is no universal standard for this yet, but the direction is clear: access should depend on context, not just tunnel presence.
One common edge case is a remote administrator who needs emergency access to production. A VPN may still be part of the workflow, but it should be paired with step-up authentication, session recording, and privileged access management. Another case is automation over VPN, where a build agent or script can appear legitimate while using stale secrets. That is why NHIs need separate governance from human users, including rotation, revocation, and ownership tracking. NHI Management Group’s research on the Ultimate Guide to NHIs shows how often organisations underestimate the persistence of exposed secrets and service accounts.
VPNs also fall short in segmented or zero trust architectures, where network location should not determine trust. In those environments, the more reliable control is continuous identity and session validation with short-lived authorization. A VPN that is not paired with those controls becomes most fragile when legacy trust assumptions meet modern cloud and automation workloads.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-1 | VPNs are often mistaken for trust; access control must verify identity, not location. |
| OWASP Non-Human Identity Top 10 | NHI-03 | VPNs do not solve long-lived credential risk, which is central to NHI abuse. |
| NIST Zero Trust (SP 800-207) | Zero trust directly rejects network location as a trust boundary for access. |
Treat VPN access as one signal and enforce identity-based, continuous access decisions.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 23, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
