Virtual Private Networks (VPNs) have become one of the most advertised cybersecurity tools online. They are marketed as a way to stay safe from hackers, government surveillance, and data collection. But in practice, VPNs do not provide the level of protection most people expect.
The truth is simple, VPNs can help with some privacy concerns, but they are not a complete security solution. Worse, in many cases, VPN services themselves introduce new vulnerabilities.
Corporate VPNs vs. Consumer VPNs
There are two main categories of VPNs:
- Corporate VPNs — used by organizations to allow employees to connect securely to internal networks.
- Consumer VPNs — used by individuals for privacy, streaming access, or bypassing censorship.
Both categories face major security issues.
In 2024, several VPN vendors reported critical vulnerabilities. Fortinet, for example, faced multiple CVE-rated flaws ranked 9.8 out of 10 in severity. These weaknesses included directory traversal bugs and missing authentication mechanisms—errors that would be unacceptable in modern web applications. Attackers have already exploited such flaws in real-world incidents, such as the Viasat satellite hack in Europe.
When a VPN is compromised, attackers can intercept traffic, steal credentials, and gain remote access to sensitive systems. Millions of remote workers relying on VPNs since the COVID-19 pandemic are therefore exposed to significant risks.
Browser Fingerprinting and VPN Limitations
Even if a consumer VPN is technically secure, it does not guarantee anonymity. VPNs hide your IP address from your Internet Service Provider (ISP), but attackers and advertisers can still identify you through browser fingerprinting.
Browser fingerprinting collects more than 50 data points, such as:
- Browser version
- Operating system
- Screen resolution
- Fonts and plugins installed
This combination of variables creates a unique fingerprint that can identify users even when their IP address is hidden. Electronic Frontier Foundation (EFF) has demonstrated how effective this method is at tracking individuals online.
Free VPNs Are Risky
Many free VPNs are not designed to protect users at all. Instead, they collect browsing data and sell it to advertisers or governments. A free service means the user is not the customer—the user is the product.
Intelligence agencies could even operate free VPN services to monitor traffic from activists, journalists, or ordinary users. Connecting to these services hands over all browsing activity to the very organizations users are trying to avoid.
When VPNs Still Help
Despite their flaws, VPNs can still be useful in specific cases:
- Public Wi-Fi: Airports, cafes, and hotels often use open networks vulnerable to packet sniffing and man-in-the-middle attacks. A VPN adds a layer of encryption that can prevent attackers from intercepting email or login sessions.
- Censorship bypass: In countries like China, Iran, or Russia, VPNs allow citizens to access blocked websites by routing traffic through servers in other regions.
- Streaming access: Some people use VPNs to bypass geo-blocking restrictions on services like Netflix or HBO, although many platforms now blacklist VPN IP ranges.
For these cases, VPNs are practical, but they should never be mistaken for a complete cybersecurity strategy.
Better Alternatives: Defense in Depth and Tor
Organizations should not rely on a single vendor for security. Using defense in depth—multiple layers of security from different providers—reduces the risk of a single point of failure. For example, pairing a Palo Alto firewall with a Cisco intrusion detection system provides stronger protection than using one vendor across all layers.
For individuals seeking anonymity, Tor (The Onion Router) is generally safer than a VPN. Tor routes traffic across multiple nodes, making it harder to trace. Intelligence agencies can still de-anonymize high-value targets, but for average users concerned about corporate tracking or advertising, Tor is more effective than a VPN. More information about Tor can be found at the Tor Project official site.
Key Takeaways
VPNs are not the cybersecurity silver bullet that marketing campaigns suggest. They hide your IP address from your ISP, but they do not protect against:
- Browser fingerprinting
- Insecure VPN vendor software
- Compromised or malicious VPN providers
For safer online practices in 2025:
- Use VPNs only when necessary, such as on public Wi-Fi or in censored regions.
- Avoid free VPNs—assume they are collecting and selling your data.
- Apply defense in depth by using multiple layers of security tools.
- Consider Tor if anonymity is a priority.
- Keep all VPN software patched to limit exposure to known vulnerabilities.
VPNs can play a role in a larger security strategy, but they should never be the only line of defense.
