Can a VPN Be Hacked? What the Real Risks Are (and How to Stay Protected)

People use VPNs because they want to feel safer online. That's a reasonable goal. But a question that doesn't get answered honestly enough is: can a VPN itself be hacked?

The short answer is yes — under certain conditions. But the longer answer matters a lot more, because the risk depends heavily on which VPN you use, how it's built, and what you're actually trying to protect against.

This article breaks down the real attack surfaces, what attackers actually target, and what separates a VPN that holds up from one that becomes the problem.

What "Hacking a VPN" Actually Means

When people ask if a VPN can be hacked, they usually mean one of three different things:

• Breaking the encryption — Can someone intercept and read your encrypted traffic?
• Exploiting the VPN software or server — Can an attacker compromise the VPN application or infrastructure itself?
• Compromising the VPN provider — Can the company behind the VPN be breached, exposing user data?

Each of these is a different problem with a different answer. Let's go through them one by one.

Can the Encryption Be Broken?

Modern VPN encryption is not the weak link. A VPN using AES-256 encryption or WireGuard's ChaCha20 cipher is, for practical purposes, unbreakable with current technology. Cracking AES-256 by brute force would take longer than the age of the universe even with enormous computing power.

So no — someone sitting at a coffee shop cannot decrypt your VPN traffic on the fly. That's not how attacks happen in practice.

The real encryption risk comes from weaker or outdated protocols. PPTP, for example, is a VPN protocol that has been considered broken for over a decade. L2TP/IPSec can be weakened by misconfiguration. Any VPN that still offers PPTP as a connection option is offering you a false sense of security.

WireGuard uses a fixed, modern cryptographic suite — ChaCha20 for encryption, Poly1305 for authentication, Curve25519 for key exchange. It has roughly 4,000 lines of code, which makes it far easier to audit than OpenVPN's 70,000+ lines. A smaller codebase means a smaller attack surface and fewer places for bugs to hide.

VPN Software Vulnerabilities: The Real Attack Surface

This is where the genuine risk lives. VPN software runs on servers. Servers have operating systems. Operating systems and applications have bugs. And attackers find those bugs.

According to Zscaler's 2025 VPN Risk Report, VPN CVEs (publicly disclosed vulnerabilities) grew by 82.5% over a recent multi-year period. In 2024 and early 2025, roughly 60% of those vulnerabilities carried a high or critical severity score. The most common type: remote code execution flaws — meaning an attacker can run arbitrary code on the VPN server without ever having valid credentials.

Real-world examples from 2024–2025 alone:

• Ivanti Connect Secure (CVE-2025-22457) — A critical stack-based buffer overflow that allowed unauthenticated remote code execution. Initially believed unexploitable. A suspected state-sponsored group proved otherwise.
• SonicWall SSL VPN (CVE-2024-53704) — An authentication bypass flaw that let attackers hijack active VPN sessions, bypassing MFA entirely, by sending a crafted session cookie.
• Fortinet SSL-VPN (CVE-2023-27997) — Remote code execution vulnerability. Patched, but widely exploited before organizations applied the fix.

The pattern here is not encryption failure. It's unpatched software, exposed infrastructure, and VPN appliances that sit on the public internet as high-value targets.

According to the same Zscaler report, 56% of organizations reported a VPN-related breach in the past year — and 92% of security professionals said they were concerned that unpatched VPN flaws directly lead to ransomware incidents.

Consumer VPNs vs. Enterprise VPN Appliances

It's worth separating two very different products that both get called "VPN."

Enterprise VPN appliances — hardware or software gateways like Ivanti, SonicWall, Fortinet, and Cisco AnyConnect — are the primary targets in the attack data above. These are large, complex systems deployed at the network perimeter of corporations and government agencies. When they get compromised, attackers gain a foothold into entire corporate networks.

Consumer VPN apps — the kind you install on your phone or laptop — have a much smaller attack surface. You're not running a VPN server. You're connecting to one. The app itself needs to be well-written, but you're not exposed to the infrastructure-level vulnerabilities that plague enterprise appliances.

That said, consumer VPN apps are not immune. A poorly written app can have its own vulnerabilities. A VPN app that stores credentials insecurely or that has a DNS leak will expose your browsing even while the tunnel appears active.

DNS Leaks: The Silent Exposure

A DNS leak is one of the most common and least visible ways a VPN can fail you. Here's what happens: your device is connected to the VPN, traffic is encrypted — but DNS queries (the lookups that translate domain names like "google.com" into IP addresses) slip outside the tunnel and go directly to your ISP's DNS server.

The result: your ISP can see every domain you visit, even though you thought the VPN was protecting you. You'd never know without running a leak test.

A properly built VPN routes all DNS queries through its own encrypted tunnel. This is non-negotiable. If a VPN doesn't handle DNS correctly, the encryption of the traffic itself doesn't matter much.

CyberFence's Web Shield goes further — it doesn't just route DNS privately, it actively filters DNS requests to block malicious domains, phishing sites, and ad trackers before they load.

Can the VPN Provider Be Compromised?

Yes. Any company can be breached. The question is what an attacker actually gets if they compromise the VPN provider's infrastructure.

This is why a strict zero-logs policy matters — not as a marketing slogan, but as a technical architecture decision. If a VPN provider doesn't store connection logs, timestamps, IP addresses, or browsing data, a breach of their servers yields nothing useful about what users were doing.

The most trustworthy VPN providers don't just claim zero logs — they get independently audited to verify it. An audit means a third-party security firm actually inspects the server infrastructure, configuration, and code to confirm that nothing is being stored that shouldn't be.

What to look for when evaluating a VPN's no-logs claim:

• Has it been independently audited? By whom?
• Is the company based in a jurisdiction with strong privacy laws?
• Has the company ever been compelled to hand over user data to law enforcement? What happened?
• Are the servers RAM-only (data wiped on every reboot) or disk-based?

What About Free VPNs?

Free VPNs deserve specific mention here because the risk profile is entirely different. A VPN costs money to operate — servers, bandwidth, staff, security audits. If you're not paying for it, the provider is making money some other way.

The documented cases of free VPN abuse are extensive: logging and selling browsing data to advertisers, injecting tracking scripts into web pages, harvesting device identifiers, and in several cases, operating as outright malware that used users' devices as exit nodes in botnets.

The cheapest form of "hacking a VPN" is choosing one where the provider is already selling your data. You never get hacked in the traditional sense — you just handed the keys over voluntarily.

The Kill Switch: Your Last Line of Defense

Even a well-built VPN can experience connection drops. The tunnel goes down for a few seconds while reconnecting — and in that window, your real IP address is exposed and traffic flows unencrypted.

A kill switch prevents this by cutting your internet connection the moment the VPN tunnel drops. No tunnel, no traffic. You stay dark until the VPN reconnects.

This is a feature that should be standard in any serious VPN. If a VPN doesn't have a kill switch, or if it's opt-in and buried in settings, that's a meaningful gap.

How to Choose a VPN That Actually Holds Up

Based on everything above, here's a practical checklist:

• Protocol: WireGuard or OpenVPN. Avoid PPTP and L2TP/IPSec unless you have a specific reason.
• Encryption: AES-256-GCM or ChaCha20. No exceptions.
• Zero logs: Verified by independent audit, not just stated in marketing.
• Kill switch: Present and enabled by default.
• DNS leak protection: Built in and testable.
• Jurisdiction: Where is the company incorporated? What data laws apply?
• Transparency: Does the company publish security audits? Do they have a public disclosure process for vulnerabilities?

US-based VPN providers are subject to US law, which means they can be compelled by court order to produce data — which is exactly why zero-logs architecture matters. If there's nothing stored, there's nothing to hand over.

CyberFence is operated entirely within the United States, built specifically for users who need US-operated infrastructure with verifiable privacy practices. That's a different proposition from a VPN that markets itself as "US servers" but is actually operated out of a jurisdiction with weaker privacy protections.

The Bottom Line

Can a VPN be hacked? Yes — but the vulnerability is almost never in the encryption. It's in unpatched software, poor protocol choices, DNS leaks, providers that log what they shouldn't, and free services that were never private to begin with.

The encryption in a properly built consumer VPN is sound. What matters is everything around it: the protocol, the no-logs architecture, the kill switch, the DNS handling, and the trustworthiness of the company operating it.

A well-built VPN doesn't eliminate all risk — nothing does. But it removes the most exploitable attack surfaces and gives you a meaningful privacy layer that a lazy attacker won't bother trying to get through.