Published on 24/02/2025 & Updated on 17/12/2025.

A Man-in-the-Middle (MITM) attack involves an attacker who secretly intercepts communications between two parties. This type of cyber attack has the attacker position themselves in the middle of a conversation, either impersonating one of the legitimate parties or listening in on the data exchange.

The stolen data can be exploited for various malicious purposes, including unauthorised fund transfers, identity theft, or altering account settings without the user’s consent. 

With MITM attacks accounting for 19% of all successful cyber attacks, there is a critical need for effective prevention measures that protect sensitive information. 

We’ll cover 5 man-in-the-middle attack prevention strategies below, so you can prevent MITM attacks and keep your organisation’s communications secure. 

What Is a Man-In-The-Middle Attack?

Man-in-the-middle attacks are essentially a form of eavesdropping. Attackers will use a variety of skills and strategies to listen in on conversations or snoop on data in order to gain information about an exchange. However, MITM attacks aren’t always tied to audible conversations – and there are many ways they can be carried out.

The main aim of MITM attacks is to steal sensitive information, such as account details, credit card numbers, and login credentials. High-risk targets typically include users of financial applications, SaaS businesses, and e-commerce platforms. 

How Do MITM Attacks Work?

Although the definition of a MITM attack may seem broad, there are a few specific attack strategies that are usually followed:

• DNS redirect: Falsifying DNS records to imitate fake websites with legitimate-looking URLs.
• Packet sniffing: Snooping on network activity with a packet sniffer on unsecured Wi-Fi networks.
• Bad certificates: Issuing fake SSL certificates to known fraudulent websites.
• Malware: Establishing remote access trojans on target PCs, enabling attackers to intercept the user’s actions.
• Faking websites: Creating cloned versions of known, trusted websites designed to capture login details.
• Cookie/session manipulation: Attackers use hacking tools to intercept or steal cookies from a user’s session, then use them for their own purposes.

How To Prevent Man-In-The-Middle Attacks

Here are 5 man-in-the-middle attack prevention strategies you can use to protect your privacy online.

Secure Your Wi-Fi and Router Login Credentials

According to research from All About Cookies, 69% of internet users connect to public Wi-Fi networks at least once a week, even though they are increasingly aware of the Wi-Fi security risks involved. 

One of the most common ways cybercriminals carry out MITM attacks is by exploiting vulnerabilities in weak or unsecured Wi-Fi networks. 

To prevent this, always use Wi-Fi networks that are protected with robust security protocols, like WPA2 or WPA3. These encryption standards help safeguard the data transmitted over your network, making it much harder for attackers to intercept sensitive information.

Avoid connecting to open or poorly secured public Wi-Fi networks, especially those that lack a password or use a simple, easily guessed one. These networks are prime targets for attackers looking to hijack communications.  

In addition, check that the login credentials for your router are changed from their default settings. Many routers come with easily accessible default usernames and passwords, which are often published online or found on a sticker on the device. 

If an attacker gains access to your router’s settings, they can alter the network configuration to intercept your traffic. For better security, create a strong, unique password for your router’s admin login to protect it from unauthorised access.

Stay Alert To Phishing Scams

Phishing is a deceptive tactic used by attackers to trick individuals into revealing personal or sensitive information. 

The hackers pose as trusted organisations, like popular online services or banks. This is often carried out through fraudulent emails, websites, or messages that look convincing.

The UK Government’s 2025 Cyber Security Breaches Survey found that phishing attacks are the most common type of breach, affecting 85% of businesses and 86% of charities. To protect yourself from phishing-based MITM attacks, follow these best practices:

• Double-check the sender’s email address and watch for subtle signs of forgery, like misspellings or strange domain names.

• Manually type URLs into your browser instead of clicking on suspicious links to verify the legitimacy of a website.

• Be cautious of unsolicited messages that ask for personal details or login information.

• Stay informed about the latest phishing tactics and regularly update your knowledge of emerging threats to stay one step ahead of attackers. 

At Net Consulting, our Advanced Phishing Validation Service helps protect your business from phishing threats with cutting-edge intelligence and automated checks. 

Contact us today on +44 (0)29 2097 2020 to find out more. 

Protect Connections With A VPN

In the advent of remote working, many employees are turning to newer places to work. Whether it’s a local coffee shop or their favourite lunch spot, many venues offer free Wi-Fi to visitors throughout their stay.

Although a nice gesture, these sorts of open networks are an inevitable playground for attackers. Thankfully, a VPN can provide some protection.

A Virtual Private Network (VPN) is a powerful tool for defending against man-in-the-middle (MITM) attacks by securing your internet connection and ensuring your online activities remain private. 

A VPN creates a secure, encrypted link between your device and a remote server on the Internet. This encrypted tunnel keeps all of your data traffic private as it travels over the network. 

When you activate a VPN, it encrypts your data before it leaves your device. This encryption renders the data unreadable, so it is useless to anyone who tries to intercept it. 

Here’s a breakdown of how a VPN can defend against MITM attacks:

• Encryption: The VPN tunnel encrypts data so that intercepted traffic remains unreadable. Even if attackers access the traffic, the data is useless without the encryption key.

• Authentication: VPNs authenticate servers to verify their legitimacy, preventing attackers from impersonating a trusted server.

• Data Integrity: If attackers attempt to alter the data during transmission, the encryption breaks, rendering any tampered data unusable.

• Secure Channels: VPNs establish protected pathways for data exchange, effectively preventing attackers from altering communications or inserting harmful content.

Remember to choose a reliable VPN provider with a strict no-logs policy to ensure your online activity is never shared or stored.

Enforce HTTPS In Browsers

HTTPS secures the connection between your browser and websites by using Transport Layer Security (TLS) certificates to verify identity and encrypt data, protecting it from MITM attacks. However, not all websites automatically use HTTPS, which can expose you to potential risks. 

To minimise this, you can force your browser to use HTTPS whenever available. For example, in Google Chrome, you can navigate to Privacy and Security and enable Always use secure connections. 

This setting confirms that your browser automatically switches to HTTPS, then warns you if a website doesn’t offer a secure connection. Additionally, enabling Always Show Full URLs allows you to see a website’s security status at a glance, so you can see what authentication is being used. 

Continuously Monitor Your Network

Proactively monitoring your network is essential for detecting and preventing MITM attacks. 

Regularly reviewing network traffic allows you to spot unusual patterns or suspicious activity that might signal an attack in progress. Consider deploying intrusion detection and prevention systems (IDOS) to help detect unauthorised access and suspicious communication within your network. 

Maintaining detailed logs of network activity can also provide critical insights in the event of an attack, helping you trace its origin, identify affected systems, and take swift action to minimise potential damage.  

Keeping a close eye on your network and retaining these records keeps you in a better position to mitigate the damage, such as isolating compromised systems and preventing further exploitation. 

How To Detect a Man-In-The-Middle Attack

Whether you feel your own information has been stolen, or if an employee raises a potential attack to your attention, there are thankfully a few methods of detecting a MITM attack.

• Poor network connectivity: Snooping attackers can overload your network, sometimes causing it to drop out.
• Unrecognised devices: If your router reports frequent connection requests from random devices, an attacker could be trying to gain access.
• Login attempts: Although login details can be leaked in various ways, attempted logins from unknown sources can also indicate an MITM attack.
• Browsing history: Analysing a user’s browsing history can reveal whether they’ve been tricked into browsing a fake site, and potentially fallen victim to an attack.
• DNS Queries: To verify the legitimacy of a website or DNS request, IT teams can send packet requests to URLs on a known safe PC on the network and compare the results with other requests made by potentially affected PCs.

While these detection methods can be useful, ultimately the best way to defend against a MITM attack is to prevent it from occurring. Sometimes users won’t know their data has been stolen until it’s already too late. At which point, it cannot be recovered.

The Bottom Line

Man-in-the-middle attacks pose a serious threat to businesses and individuals, compromising sensitive information and communications. The man-in-the-middle attack prevention strategies above can help you reduce the risk of falling victim to these attacks.

At Net Consulting, we specialise in helping businesses safeguard their networks and sensitive assets against evolving threats such as MITM attacks. 

Contact us today to learn how our cybersecurity solutions can provide the protection and peace of mind your organisation needs.