For more than twenty years, the VPN was the default answer to a simple question: how do we let people work from outside the office? And for twenty years, that answer was good enough. It isn't anymore.
In the last 18 months alone, critical VPN vulnerabilities have triggered CISA emergency directives, been linked to nation-state sponsored espionage campaigns across dozens of organizations, and in some cases, provided an entry point for ransomware operations that encrypted systems and disrupted business operations. The frequency of patches from legacy VPN vendors behind these products underscores a larger issue about the underlying architecture: it was not built for what the internet is today.
This isn't a hot take. It's an observable pattern.
The core issue with legacy VPNs isn't any single vulnerability. It's the design model itself.
A VPN connects a user to a network. Once authenticated, that user — or anyone who compromised their credentials — has broad lateral access. The VPN appliance sits on the public internet, advertising its presence to anyone who scans for it. And because VPN traffic is encrypted end-to-end, the appliance itself is blind to what's flowing through it.
This creates a paradox: the device meant to secure your remote access is simultaneously an exposed asset and blind spot.
Attackers know this. That's why edge devices — VPNs, firewalls, and remote access gateways — have become an initial access vector for both nation-state actors and ransomware affiliates. They target the trust boundary itself, because once it's breached, the entire network is reachable.
The last two years turned this theoretical risk into a serious, documented crisis. Ivanti Connect Secure, a widely deployed enterprise VPN product, has disclosed several critical vulnerabilities, dating back to January 2024. Multiple CVEs have been actively exploited by nation-state sponsored groups deploying custom malware that survives reboots, factory resets, and integrity checks. CISA took the rare step of ordering federal agencies to disconnect Ivanti products to prevent compromise.
SonicWall experienced a similar crisis starting in mid-2025, when the Akira ransomware group began systematically targeting SonicWall SSL VPN devices. Attackers moved from initial VPN login to ransomware deployment in under four hours, and in some cases bypassed multi-factor authentication entirely. It is estimated that more than 70 organizations were compromised in a single October 2025 wave. Then SonicWall disclosed that its cloud backup service had been breached, exposing firewall configuration files — including stored credentials — for customers using MySonicWall.
Check Point faced a similar crisis when CVE-2024-24919, rated as high severity, turned out to be far more severe than initially disclosed, allowing attackers to extract every password hash, SSH key, and certificate on affected gateways.
These aren't edge cases. They're three of the largest VPN vendors in the mid-market.
The natural response has been a rush toward Zero Trust Network Access (ZTNA). Gartner projects that by now, over 70% of new remote access deployments use ZTNA over VPN. And that shift is directionally correct — ZTNA eliminates broad network access and enforces identity-based, application-specific connections.
But most ZTNA solutions solve only half the problem.
They verify who gets access. They don't inspect what flows through the connection. A user with valid credentials downloading a malicious file? A compromised endpoint exfiltrating data over an approved application? A polymorphic payload embedded in a legitimate-looking PDF? Your typical ZTNA solution waves all of this through without a second look.
This is the gap that separates access control from active defense — and it's the gap that attackers are already exploiting.
Replacing a VPN shouldn't mean trading one blind spot for another. A real replacement needs to do three things simultaneously:
This is the model Trinity Cyber calls Active Network Defense. It's a fully managed platform that integrates Full Content Inspection™ with Zero Trust Native Policy Control, providing the SSE functions organizations expect (SWG, ZTNA, cloud firewall, IPS, browser isolation) with a fundamentally different threat defense engine underneath.
The result: a platform that protects 3+ million users globally, defends 250+ million network assets hourly, and operates at a .009% false positive rate — all without generating a single alert for your team to triage.
No detection and response required, no alert queue to triage. No 3AM phone calls. Threats are simply disarmed in transit.
If your organization is still running a legacy VPN — or if you've moved to a ZTNA solution that doesn't inspect content — the question isn't whether to replace it. The question is how quickly you can move.
The threat landscape isn't waiting for your renewal cycle. Nation-state actors are studying patches and weaponizing vulnerabilities within weeks. Ransomware affiliates are compressing their attack chains to hours. And the AI-driven threats emerging now generate polymorphic payloads faster than any signature-based system can keep up.
The VPN era is over. What comes next should be built for the threats that actually exist — not the ones we imagined twenty years ago.