For roughly two decades, “remote access” and “corporate VPN” were effectively synonyms. An employee working outside the office connected to a VPN concentrator, was granted an IP address inside the corporate network, and from that point on could generally reach whatever internal systems their credentials allowed — often more than they actually needed. That model, once the default for enterprise IT everywhere, is increasingly being replaced, and the shift has accelerated noticeably this year as more organizations complete migrations that were, until recently, still largely theoretical.
The Core Problem With Traditional Enterprise VPNs
The architectural weakness of a traditional VPN isn’t really about encryption — the tunnels themselves are typically well-secured. The weakness is what happens after the tunnel is established: a connected device is treated as trusted and placed on the internal network, often with far broader access than the specific task requires. Security teams describe this as the “flat network” problem. Once inside, an attacker who compromises a single employee’s laptop or credentials — through phishing, malware, or a leaked password — can potentially move laterally across the internal network, probing for other vulnerable systems, because the VPN’s job was simply to authenticate the connection, not to continuously evaluate what that connection should actually be allowed to touch.
This weakness became far more consequential once remote and hybrid work became permanent fixtures rather than temporary exceptions. A model designed for a relatively small number of employees occasionally connecting from known devices scaled poorly to a workforce connecting daily from a wide mix of personal devices, home networks, and public Wi-Fi, dramatically expanding the practical attack surface a traditional corporate VPN was ever designed to defend.
What Zero Trust Network Access Actually Changes
Zero Trust Network Access (ZTNA) replaces the “connect and you’re in” model with continuous, granular verification. Rather than placing a device on the internal network as a whole, ZTNA grants access to specific applications and resources individually, based on an ongoing evaluation of identity, device health, location, and behavior — not a single login event. A few of the core architectural differences are worth spelling out:
- Application-level access, not network-level access: Users connect directly to the specific application or service they need, never gaining visibility into the broader internal network the way a traditional VPN connection does by default.
- Continuous verification: Trust is re-evaluated throughout a session rather than granted once at login — a device that fails a security posture check midway through a session (say, its endpoint protection is disabled, or it connects from an unexpected location) can have access revoked immediately rather than at the next login.
- No exposed network entry point: Traditional VPN concentrators are internet-facing infrastructure, and therefore a visible, attractive target for attackers scanning for vulnerabilities. Most ZTNA architectures avoid exposing a comparable entry point, brokering connections instead through a cloud-based control plane.
- Device posture as an access criterion: Whether a device has up-to-date security patches, endpoint protection running, and disk encryption enabled becomes part of the access decision itself, not a separate compliance check handled elsewhere.
Why the Shift Is Accelerating Now
Several converging factors explain why enterprise adoption has moved from “pilot program” to “active migration” more broadly this year. Cyber-insurance underwriters have increasingly begun asking about network segmentation and access-control architecture as part of their risk assessments, effectively pricing the flat-network weakness of traditional VPNs into premiums. Ransomware groups have also continued to demonstrate, through a steady stream of publicized incidents, how effectively lateral movement across a flat internal network can turn a single compromised endpoint into an organization-wide breach — a pattern security teams increasingly cite directly when building the business case for migration. And the practical experience of supporting a genuinely hybrid workforce — one that may never again be predominantly office-based — has made IT teams considerably less willing to tolerate the operational overhead traditional VPN concentrators impose at scale, including capacity planning for peak concurrent connections and the latency penalties of routing all traffic through a central hub regardless of destination.
“The conversation with security leadership has changed,” said an enterprise architect involved in several recent ZTNA migrations. “It used to be ‘should we look at this eventually.’ Now it’s ‘how fast can we get off the flat network,’ and that’s a very different budget conversation.”
The Migration Isn’t Simple, Though
None of this means enterprise VPNs are disappearing overnight, and organizations attempting rapid, wholesale migrations have run into real friction. Legacy applications not built with modern authentication in mind can be difficult to bring into a ZTNA model without significant re-architecture. Organizations with complex, deeply interdependent internal systems — where applications routinely need to communicate directly with each other, not just with individual users — sometimes find that a pure ZTNA approach requires more upfront mapping of application dependencies than anticipated, a discovery phase that has, in more than a few documented cases, taken longer than the technical implementation itself. And employee experience during migration matters more than IT teams sometimes initially budget for: a poorly executed transition, where access to a needed application suddenly requires a support ticket because it wasn’t properly mapped in the new system, generates exactly the kind of user friction that erodes confidence in the new architecture regardless of its underlying security merits.
The Hybrid Reality Most Organizations Are Actually Living In
Rather than a clean rip-and-replace, the more common pattern emerging across mid-size and large organizations is a hybrid state that may persist for years rather than months: ZTNA handling access to modern, cloud-hosted, and newly-deployed applications, while a traditional VPN continues serving as the access path for legacy systems that haven’t yet been — and in some cases may never be — re-architected for granular access control. Security teams generally view this as an acceptable, even sensible, intermediate state rather than a failure to complete migration, provided the traditional VPN’s scope is deliberately narrowed over time rather than left as the default, catch-all access method it once was.
The Vendor Landscape Is Getting Crowded and Confusing
One practical complication for IT decision-makers evaluating this shift is that the ZTNA vendor landscape has grown considerably more crowded, and not always in ways that make comparison straightforward. The term “Zero Trust” itself has suffered some of the same definitional dilution that “no-logs” has experienced in the consumer VPN space — a growing number of vendors apply the label to products that implement only a subset of true zero-trust principles, such as adding multi-factor authentication to an otherwise traditional flat-network VPN, without the granular, application-level access control and continuous verification that more rigorous implementations provide. Analysts covering this space have increasingly urged enterprise buyers to evaluate specific architectural claims rather than the marketing term alone, asking pointed questions about whether a given product actually grants access at the individual application level, whether device posture is genuinely evaluated on an ongoing basis rather than only at initial login, and whether the vendor’s own infrastructure has itself been independently assessed for the kind of exposed attack surface the architecture is meant to eliminate in the first place.
This confusion has, if anything, made vendor selection more time-consuming for security teams even as the underlying case for migration has grown stronger, since due diligence now requires digging past marketing claims that all sound remarkably similar on the surface. Several organizations report running structured proof-of-concept evaluations against multiple vendors simultaneously specifically because product literature alone no longer provides enough differentiation to make a confident decision, a level of pre-purchase scrutiny that was less common when the enterprise remote-access market was dominated by a smaller number of well-established, functionally similar traditional VPN vendors.
What This Means for the Broader VPN Industry
For consumer VPN providers, this trend carries limited direct relevance — ZTNA is fundamentally an enterprise access-control architecture, not a consumer privacy tool, and the two markets serve genuinely different needs. But for providers with meaningful enterprise or business-tier product lines, the shift is significant enough that several have begun expanding beyond traditional VPN offerings into ZTNA-adjacent products, either through in-house development or acquisition, recognizing that enterprise IT buyers are increasingly evaluating remote-access vendors on ZTNA capability as a baseline expectation rather than an optional add-on. The providers treating this as a passing trend rather than a structural shift in how enterprises think about network access are likely to find themselves competing for a shrinking segment of the enterprise remote-access market in the years ahead.
What Smaller Organizations Should Take From This
Much of the public discussion around ZTNA migration understandably centers on large enterprises with dedicated security teams and substantial budgets, but the underlying architectural lesson is relevant well beyond that segment. Smaller organizations without the resources for a full, formal ZTNA migration can still apply the core principle — narrowing default access rather than granting broad network-level trust to any authenticated connection — through more modest steps: segmenting internal networks so a compromised device can’t freely reach every system, applying multi-factor authentication consistently rather than only for high-privilege accounts, and auditing which employees and devices actually need standing access to which systems, rather than defaulting to broad access simply because it’s more convenient to configure once and not revisit.
Security consultants working with smaller organizations report that this incremental approach — treating zero trust as a set of principles to apply gradually rather than a specific product to purchase all at once — tends to produce more durable security improvements than attempting a full architectural overhaul without the budget or staff to sustain it. For organizations of any size, the underlying lesson from this year’s enterprise shift is less about any specific vendor or product category and more about a broader rethinking of a long-standing assumption: that a successful login should be treated as sufficient proof of trustworthiness for everything that follows. That assumption, increasingly, no longer holds up to scrutiny — a fact the traditional corporate VPN model was built around, and the reason it’s now being so widely reconsidered.