In early 2024, Ivanti disclosed critical vulnerabilities in its Connect Secure VPN that were already being actively exploited by threat actors — including nation-state groups. CISA issued an emergency directive ordering federal agencies to disconnect affected devices within 48 hours. It was a brutal reminder: a VPN isn't a magic shield. Misconfigured, unpatched, or poorly managed, it becomes the front door attackers walk right through. These VPN best practices aren't theoretical. They come from watching organizations get breached through the very tool they trusted to keep them safe.

If you're running a VPN for remote access — whether for five employees or five thousand — this post covers what actually matters. Not marketing fluff from VPN vendors. Real, specific guidance grounded in breach data and operational experience.

Why Most VPN Deployments Are Weaker Than You Think

Here's what I've seen over and over: an organization deploys a VPN, checks the "secure remote access" box, and never revisits the configuration. Meanwhile, the Verizon 2024 Data Breach Investigations Report found that exploitation of vulnerabilities as the initial access vector nearly tripled year-over-year, with VPN appliances among the most targeted edge devices.

The problem isn't VPN technology itself. It's how organizations deploy and maintain it. Default configurations. Stale credentials. No segmentation once a user connects. A VPN that grants full network access to anyone with a username and password is barely better than no VPN at all.

Threat actors know this. They buy stolen VPN credentials on dark web marketplaces. They exploit unpatched appliances. They use social engineering to trick employees into handing over their login details. Your VPN is only as strong as the practices surrounding it.

The VPN Best Practices That Actually Reduce Risk

Let's get specific. These are the practices that separate organizations that get breached from those that don't.

1. Enforce Multi-Factor Authentication — No Exceptions

If your VPN only requires a username and password, you're one phishing email away from a breach. Credential theft is the single most common way attackers gain initial access, and VPN credentials are high-value targets.

Enforce multi-factor authentication (MFA) on every VPN connection. Use hardware tokens or authenticator apps — never SMS-based MFA if you can avoid it. SIM-swapping attacks have made SMS codes unreliable for high-value access points like VPNs.

I've investigated incidents where an attacker had valid VPN credentials for months. MFA would have stopped every single one of them.

2. Patch VPN Appliances Like Your Business Depends on It

Because it does. VPN appliances sit at the edge of your network, exposed to the internet. When a vulnerability drops, attackers begin scanning within hours.

The Ivanti Connect Secure exploits I mentioned weren't exotic zero-days by the time most organizations were hit. Patches and mitigations were available. The organizations that got compromised were the ones that waited. CISA maintains a Known Exploited Vulnerabilities Catalog — if your VPN appliance shows up there, treat it as an emergency, not a scheduled maintenance item.

3. Implement Least-Privilege Network Access

A VPN connection should not mean unrestricted access to your entire internal network. Yet that's exactly how most small and mid-sized organizations configure it.

Segment your network. Define access policies based on user role. Your marketing team doesn't need access to database servers. Your contractor doesn't need access to HR file shares. Use your VPN's access control features — they exist for a reason.

This is where zero trust principles intersect directly with VPN best practices. Authenticate the user, verify the device posture, and grant access only to the specific resources that user needs. Nothing more.

4. Kill Split Tunneling Unless You Have a Good Reason

Split tunneling lets users route some traffic through the VPN and some directly to the internet. It reduces bandwidth load on your VPN concentrator. It also means a compromised endpoint can reach your internal network and an attacker's command-and-control server simultaneously.

For most organizations, full tunneling is the safer default. If you must use split tunneling — for bandwidth or performance reasons — restrict it carefully. Route all DNS queries through the VPN. Block known malicious destinations at the endpoint level. And monitor the traffic patterns for anomalies.

5. Use Strong, Modern Encryption Protocols

If your VPN is still running PPTP or L2TP/IPSec with pre-shared keys, you're using encryption that was considered weak a decade ago. Migrate to IKEv2/IPSec or WireGuard. If you're running an SSL VPN, ensure TLS 1.2 at minimum — TLS 1.3 preferred.

Check your cipher suites. Disable anything using DES, 3DES, RC4, or MD5. NIST's cryptographic standards guidance provides clear recommendations on which algorithms are still considered acceptable.

6. Monitor VPN Logs Like an Attacker Is Already Inside

Most organizations collect VPN logs. Almost none actively monitor them. I've seen VPN connection logs that showed an attacker logging in from three different countries in a single day — and nobody noticed for weeks.

Set up alerts for impossible travel scenarios (logins from geographically distant locations in short timeframes). Flag connections at unusual hours. Watch for a single account establishing multiple simultaneous sessions. Feed VPN logs into your SIEM or monitoring platform and build detection rules around abnormal behavior.

7. Regularly Audit User Accounts and Access

Former employees with active VPN credentials are a recurring theme in breach investigations. Contractors whose projects ended six months ago but whose accounts are still live. Service accounts with hardcoded passwords that haven't changed in years.

Audit VPN user accounts quarterly at minimum. Disable accounts immediately upon termination. Rotate credentials for service accounts on a defined schedule. This is basic hygiene, but it's the basic hygiene that organizations consistently fail at.

What Are VPN Best Practices? A Quick-Reference Answer

VPN best practices are the security configurations, policies, and operational procedures that ensure a Virtual Private Network actually protects your data and network. They include enforcing multi-factor authentication, patching appliances immediately when vulnerabilities are disclosed, applying least-privilege access controls, using modern encryption protocols, actively monitoring connection logs, and regularly auditing user accounts. Without these practices, a VPN creates a false sense of security while leaving your organization exposed to credential theft, ransomware, and lateral movement by threat actors.

The Human Element: Where VPN Security Breaks Down First

Every technical control in this post can be undermined by one employee clicking a well-crafted phishing email. Attackers don't need to exploit a VPN vulnerability if they can simply steal legitimate credentials through social engineering.

I've seen phishing campaigns that perfectly replicated VPN login portals — complete with the organization's branding and a convincing domain name. Employees entered their credentials, and the attacker used them to connect within minutes. MFA helps, but even MFA can be bypassed with real-time phishing proxies like EvilGinx if your users aren't trained to spot the attack.

This is why security awareness training isn't optional. It's a core VPN security control. Your employees need to recognize phishing attempts targeting their VPN credentials specifically. They need to understand why they should never enter credentials on a page they reached through an email link.

Our cybersecurity awareness training program covers exactly these scenarios — real-world attacks targeting real-world access points like VPNs, email, and cloud applications. And for organizations that want to test their defenses, our phishing awareness training for organizations runs realistic phishing simulations that show you exactly where your human vulnerabilities are before an attacker finds them.

Zero Trust Doesn't Replace Your VPN — It Makes It Smarter

There's been a lot of buzz about zero trust architecture replacing VPNs entirely. In my experience, that's premature for most organizations. What zero trust actually does is change how you think about VPN access.

Instead of treating the VPN as a perimeter — inside is trusted, outside is not — zero trust means every connection is verified continuously. Device posture checks before granting access. Continuous authentication during a session. Micro-segmentation that limits blast radius if a credential is compromised.

NIST Special Publication 800-207 lays out the zero trust architecture framework. You don't need to implement it all at once. Start by adding device health checks to your VPN policy. Require endpoint detection and response (EDR) agents to be running. Verify that OS patches are current before granting access. Each layer reduces risk incrementally.

Ransomware Gangs Love Poorly Configured VPNs

The FBI's Internet Crime Complaint Center (IC3) has repeatedly highlighted VPN exploitation as a primary initial access vector in ransomware attacks. It makes sense — a VPN gives an attacker authenticated, encrypted access to your internal network. It's the perfect entry point.

Groups like LockBit, BlackCat/ALPHV, and Cl0p have all leveraged compromised VPN credentials and unpatched VPN appliances in their attack chains. Once inside, they move laterally, escalate privileges, exfiltrate data, and deploy ransomware. The initial VPN compromise often happens weeks or months before the ransomware detonates.

If you take one thing from this post, let it be this: your VPN configuration is a direct input to your ransomware risk. Every practice I've listed — MFA, patching, least privilege, monitoring, user training — directly reduces the likelihood that a ransomware group uses your VPN as their entry point.

A Practical VPN Security Checklist for 2026

Here's what I'd audit tomorrow if I inherited your network:

  • MFA enforced on all VPN connections — hardware tokens or authenticator apps preferred
  • VPN appliance firmware current — checked against CISA's Known Exploited Vulnerabilities Catalog
  • Access policies enforce least privilege — users only reach what they need
  • Split tunneling disabled or tightly controlled with DNS routing through the VPN
  • Encryption protocols modern — IKEv2/IPSec, WireGuard, or TLS 1.3
  • Logging and monitoring active — alerts configured for impossible travel, unusual hours, concurrent sessions
  • Account audits performed quarterly — terminated users removed within 24 hours
  • Phishing simulations run regularly to test employee resilience against credential theft
  • Device posture checks required before VPN access is granted
  • Incident response plan includes VPN compromise as a specific scenario

Print that out. Tape it to the wall. Work through it line by line. Each item you implement meaningfully reduces your attack surface.

The Bottom Line on VPN Security

A VPN is a tool, not a strategy. Deploying one without following VPN best practices is like installing a deadbolt and leaving the key under the mat. The technology is sound — the implementation is where organizations fail.

Patch relentlessly. Enforce MFA everywhere. Limit access to what's necessary. Monitor for anomalies. And train your people to recognize the social engineering attacks that bypass every technical control you've built.

That's not theoretical advice. It's what separates organizations that read about data breaches from organizations that become one.