In the modern world, public wi-fi is ever pervasive – and is an essential tool for both businesses and wi-fi taking care of tasks on the go. Whether livening up a dull report with a coffee shop cake, making the most of lost time in airports or hotels, or enjoying collaboration in co-working spaces, free Wi-Fi networks allow professionals to stay connected, respond to emails, and access cloud-based services. However, the very convenience of public Wi-Fi is also its greatest risk.
Public wi-fi is one of cybercriminals’ favourite targets, and they actively focus on hacking unsecured networks, using sophisticated techniques to intercept data, steal login credentials, and even gain access to business systems. Without proper precautions, a simple login to public Wi-Fi could put your organisation at risk.
To help you stay safe, we took a closer look at some of the key threats of public Wi-Fi, the risks they pose to businesses, and best practices to stay secure while staying connected.
Why is public wifi risky?
Unlike private corporate networks, public Wi-Fi lacks the security measures needed to protect users from cyber threats. Most public networks do not encrypt data, making it easy for hackers to intercept information. Here are some of the most common risks associated with public Wi-Fi:
Man-in-the-Middle (MITM) attacks
One of the biggest threats on public Wi-Fi is a man-in-the-middle (MITM) attack. As the name suggests, this occurs when a cybercriminal secretly intercepts data between two parties—for example, between your device and the public Wi-Fi router. If successful, this allows hackers to eavesdrop on sensitive information, such as login details, emails and confidential messages, sensitive financial transactions and customer data – all of which could potentially put your whole business at risk.
Rogue wi-fi networks
Hackers often set up fake Wi-Fi hotspots with legitimate-sounding names like “Free Café Wi-Fi” or “Hotel Guest Network”. When unsuspecting users connect, the attacker gains full access to their device, online activity, and sensitive data. Once connected, they can monitor your browsing activity, allowing them to seal passwords and business data and potentially even inject malware into your device.
This can be one of the easiest types of attack to fall for – particularly if you are busy and stressed, keen to connect as soon as possible. Always take your time, and double check any public wi-fi channels associated with an organisation to verify their legitimacy.
Packet sniffing and data interception
Packet sniffing is a technique used to intercept and analyse data packets as they travel across a network. While it has legitimate uses in network troubleshooting and security monitoring, cybercriminals exploit it to steal sensitive information, especially on public Wi-Fi networks.
Public Wi-Fi often lacks encryption and authentication, allowing hackers to monitor unprotected data such as login credentials, emails, and payment details. If traffic is not encrypted via a VPN or HTTPS, attackers can easily intercept and exploit it, making packet sniffing a major cybersecurity threat.
Session hijacking
Many websites use cookies to remember user sessions, and, with the right tools, hackers can steal these session cookies while you’re logged into a business account, allowing them to access your email or cloud services, impersonate you in online transactions – this can be a particularly significant issue if they impersonate figures such as CEO’s or CFO’s – or gain unauthorised access to corporate systems
Malware injection
If an attacker has access to the same public network that you are working on, they can exploit software vulnerabilities to remotely install malware on your device. This could include:
- Keyloggers – Record everything you type, including passwords.
- Ransomware – Lock your files and demand payment.
- Spyware – Track your online activity and extract sensitive data.
How do public wi-fi risks impact businesses?
Corrupted or compromised public Wi-Fi doesn’t just pose risks to individual employees—it can compromise entire corporate networks. If an employee logs into work emails, financial platforms, or cloud-based systems via unsecured Wi-Fi, attackers can infiltrate business data.
Some of the key risks that organisations may face include:
- Data breaches – Exposed customer data, financial details, and internal documents.
- Credential theft – Stolen passwords leading to account takeovers.
- Compliance violations – Breaches of GDPR and data protection laws.
- Business Email Compromise (BEC) – Attackers impersonating employees to commit fraud.
Cybercriminals specifically target corporate users on public Wi-Fi, knowing they are likely to handle valuable business data. A single compromised device could lead to widespread security incidents.
How to stay safe on public wi-fi
While the best approach is to avoid public Wi-Fi altogether, the truth is that this is not always possible; life is busy, and there will inevitably be times when you need to simply log on and go. Fortunately, there are security measures businesses and employees can take to stay protected:
Invest in a VPN (Virtual Private Network)
A VPN encrypts all internet traffic, making it unreadable to hackers. Even if an attacker intercepts data, it will be encrypted and useless. Businesses should provide employees with a corporate VPN and ensure it is always enabled when working remotely, and employees should always connect to a trusted, business-approved VPN before using public Wi-Fi.
Enable Two-Factor Authentication (2FA)
Two-Factor Authentication (2FA) is a security measure that adds an extra layer of protection to online accounts by requiring two forms of verification before granting access.
Instead of relying solely on a password, 2FA prompts users to provide a second factor, such as a password or PIN, single-use code or biometric data. Even if a hacker steals your credentials via public wi-fi, 2FA prevents unauthorised logins by requiring a second verification step (such as a code sent to your phone).
Turn off auto-correct
Many devices automatically connect to available Wi-Fi networks, which can be exploited by rogue hotspots. Protect yourself by disabling auto-connect settings on all business devices, and only connecting to trusted Wi-Fi networks that require authentication.
Verify network legitimacy
It is important to always confirm the correct network name with staff before connecting. Avoid networks that require no password—these are prime targets for cybercriminals. If unsure, use mobile data or a secure personal hotspot instead.
Keep software and security patches up to date
Outdated software is full of vulnerabilities that hackers can exploit. Regular updates ensure that security patches are applied, reducing the risk of malware infections. Enable automatic updates on all work devices.
Use secure websites (HTTPS)
Avoid entering sensitive information on websites that lack HTTPS encryption. Secure sites have a padlock symbol in the address bar, ensuring that data is encrypted. Consider using browser extensions that force HTTPS connections.
Remember to log out after use
After using any online service, make sure you log out completely to prevent session hijacking. Closing the browser window is not enough—always click “Log Out” manually. In addition, it is a good habit to automatically clear cookies and browser history after using public Wi-Fi.
Monitor for suspicious activity
Employees should regularly check bank statements, work emails, and business accounts for unusual activity, allowing it to be flagged and reviewed as quickly as possible. Businesses should implement cybersecurity training to ensure staff recognise and report suspicious incidents.
Final Thoughts
Public wi-fi has become an essential tool for modern professionals, but its convenience comes with serious security risks. From data interception and session hijacking to rogue networks and malware injections, cybercriminals actively exploit unsecured networks to steal sensitive information. The risks don’t just affect individuals—a single compromised device can expose entire business networks, leading to data breaches, financial losses, and compliance violations.
While avoiding public Wi-Fi altogether is the safest approach, realistically, that’s not always possible. Businesses must ensure employees understand the dangers and are equipped with the right tools and knowledge to stay protected. By implementing a corporate VPN, enabling Two-Factor Authentication (2FA), keeping software updated, and training employees on best practices, organisations can reduce the risks and ensure their workforce stays secure—even on the go.
Public Wi-Fi doesn’t have to be a security nightmare, but staying safe requires awareness, vigilance, and proactive cybersecurity measures. By prioritising security, businesses can protect their data, safeguard their employees, and maintain trust in an increasingly connected world.