For two decades, the corporate VPN was the default answer to a simple problem: how do you let employees access internal systems securely from outside the office? Log in, authenticate once, and you’re on the network — trusted, more or less, the same way you’d be trusted sitting at a desk in headquarters. That model made sense in a world of centralized offices and predictable, castle-and-moat network architecture. It makes a lot less sense now, and enterprises have been abandoning it faster than most people outside IT departments realize.
The replacement gaining momentum across the corporate world is Zero Trust Network Access, or ZTNA — a fundamentally different philosophy that assumes no user or device should be automatically trusted, regardless of whether they’re connecting from inside or outside the traditional network perimeter.
Why the Old VPN Model Started Breaking Down
The core weakness of the traditional corporate VPN model is baked into its design: once a user authenticates and connects, they typically gain broad access to the internal network, often far more access than their actual job requires. This “trusted once, trusted everywhere” approach made a certain amount of sense when most employees worked from a single, well-secured office network. It’s a much riskier proposition in a world of remote work, personal devices, contractor access, and cloud-based systems that live entirely outside any traditional network perimeter in the first place.
The practical danger is straightforward: if a single set of employee credentials is compromised, or if a malware infection reaches a device connected via VPN, the traditional model can give an attacker a relatively wide-open path to move laterally across internal systems. Security teams have watched this exact scenario play out in breach after breach across the industry, and it’s a major reason the old model has lost credibility as a standalone security strategy.
What Zero Trust Actually Means in Practice
Zero Trust Network Access flips the underlying assumption. Instead of granting broad network access after a single login, ZTNA enforces continuous, granular verification for every individual connection to every individual application or resource. A few core principles define the approach:
- Least-privilege access — users and devices get access only to the specific applications and resources they need for their role, not the network as a whole.
- Continuous verification — trust isn’t established once at login and left alone; it’s re-evaluated based on device health, location, behavior patterns, and other contextual signals throughout a session.
- Application-level segmentation — rather than connecting a user to an entire network segment, ZTNA creates individual, encrypted connections directly to specific applications, meaning a compromised device can’t automatically “see” other systems on the network.
- Identity as the real perimeter — rather than defending a physical or network boundary, ZTNA treats verified identity and device posture as the actual security boundary, regardless of where a connection originates.
Why Now? The Convergence of Several Trends
ZTNA isn’t a brand-new idea — the underlying principles have circulated in security architecture circles for years — but adoption has accelerated sharply as several trends converged at once. Remote and hybrid work normalized connections from unmanaged home networks and personal devices in a way corporate security models were never built for. Cloud migration meant more and more critical business applications no longer lived inside a traditional network perimeter that a VPN could meaningfully protect. And a steady stream of high-profile breaches involving compromised VPN credentials gave security leadership boards concrete, visible reasons to fund a architectural shift rather than treating it as a theoretical improvement.
Put together, these trends have pushed ZTNA from an interesting security concept discussed at conferences into a budgeted, board-level priority at a growing number of organizations.
Does This Mean VPNs Are Dying in the Enterprise?
Not exactly — the picture is more nuanced than a clean replacement. Many organizations are running ZTNA and traditional VPN infrastructure side by side during extended transition periods, particularly for legacy applications that weren’t built with modern identity-based access controls in mind and would require significant re-engineering to work cleanly with a ZTNA model. Full migration away from VPN infrastructure tends to be a multi-year process for larger organizations with complex, older application portfolios.
It’s also worth separating the enterprise conversation from the consumer one. Everything described here applies to corporate network access architecture — how a company protects its internal systems and applications. It has essentially no bearing on consumer VPN services, which solve a completely different problem: encrypting an individual’s personal internet traffic for privacy, security on public networks, and content access. Consumer VPN demand, as covered elsewhere on Goliry, continues to grow for reasons entirely separate from the enterprise ZTNA shift.
The Challenges of Making the Switch
Zero Trust sounds clean in a slide deck; implementing it is considerably messier. A few recurring challenges show up across organizations making the transition:
- Legacy application compatibility. Older internal systems, sometimes decades old, often weren’t designed with the kind of granular identity-based access controls ZTNA requires, forcing either costly re-engineering or hybrid workarounds.
- User experience friction. Continuous verification, done poorly, can mean more frequent authentication prompts and a noticeably more interrupted workflow — a real adoption risk if employees find the new system more annoying than the VPN it replaced.
- Implementation complexity and cost. Properly deploying ZTNA requires mapping out exactly which users need access to which specific applications — a significant discovery and configuration project for large organizations with sprawling, loosely documented application environments.
- Vendor fragmentation. The ZTNA market includes a wide range of vendors with different architectural approaches, and choosing the wrong platform can mean a costly re-implementation down the line.
What Security Leaders Are Prioritizing
Organizations further along in their ZTNA journeys tend to share a common pattern: they start with the highest-risk access paths first — third-party contractors, privileged administrative access, and connections to the most sensitive internal systems — rather than attempting a single, organization-wide cutover. This phased approach limits disruption while delivering the most meaningful security improvement early, and it gives security and IT teams real operational experience with the new model before extending it across the entire organization.
The organizations getting this right aren’t treating Zero Trust as a product they bought — they’re treating it as an ongoing architectural discipline. The technology is only half the project; the other half is actually knowing who needs access to what.
Looking Ahead
The direction of travel in enterprise security is clear, even if the pace varies widely by organization. The old model of “connect to the VPN, trust the network” is increasingly seen as a liability rather than a solution, and Zero Trust principles are steadily becoming the expected baseline for how serious organizations think about remote and internal access alike. The corporate VPN won’t disappear overnight — legacy systems and transition timelines will keep parts of it around for years — but its role is narrowing, from the primary security perimeter it once was to one component in a much more granular, identity-driven access model.
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