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Have you used a USB port to charge your phone in public? You could be at risk of “Juice Jacking”.

Posted on September 27, 2023
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  • Have you used a USB port to charge your phone in public? You could be at risk of “Juice Jacking”.

In today’s technology-driven world, our reliance on portable devices such as smartphones and tablets has become indispensable. Whether we’re traveling or simply going about our daily lives, keeping our devices charged is a top priority. However, using public USB charging stations can expose us to a hidden danger known as “juice jacking.” In this article, we will explore what juice jacking is, the risks associated with it, and most importantly, how to protect yourself from falling victim to this cyber threat.

What is Juice Jacking?

Juice jacking is a security exploit that occurs when an infected USB charging station or cable is used to compromise devices that connect to it. The exploit takes advantage of the fact that a mobile device’s power supply passes over the same USB cable that is used to sync data. Cyber criminals can use this opportunity to load malware onto the charging station or infect the connection cable, thereby gaining unauthorized access to the connected device.

The Risks of Juice Jacking

Juice jacking poses significant risks to individuals who unknowingly connect their devices to compromised charging stations. Here are some of the potential risks associated with juice jacking:

  1. Data Theft: Cyber criminals can steal sensitive information such as passwords, files, contacts, texts, and voicemails from your device without your knowledge. The longer your device remains connected to a compromised cable or port, the greater the risk of data compromise.
  2. Malware Installation: Malware loaded onto the charging station or transmitted through the infected cable can cause substantial damage to your device. This includes manipulating your device, spying on your activities, locking you out of your device, or stealing personal information.
  3. Multidevice Attack: Devices charged using infected cables can, in turn, become carriers of the same malware, potentially infecting other cables and ports. This creates a chain reaction, spreading the malware to unsuspecting users.
  4. Disabling Attack: Certain types of malware uploaded through a charging device can completely lock owners out of their devices, providing full access to the attackers.

How Juice Jacking Works

Juice jacking is a hardware-focused man-in-the-middle attack. The attacker either loads malware directly onto the charging station or infects a connection cable and leaves it plugged in, waiting for an unsuspecting victim to connect their device. When a device is connected, the compromised hardware transfers the malware onto the device, granting the attacker unauthorized access.

USB ports and phone charging cables are the most common devices used in juice jacking attacks. However, other less common devices, such as USB ports in video arcade consoles and portable battery power banks, can also be compromised.

Protecting Yourself from Juice Jacking

While juice jacking poses a real threat, there are several steps you can take to protect yourself and your devices. By following these tips, you can significantly reduce the risk of falling victim to this cyber threat:

1. Use AC Power Outlets

Using AC power outlets instead of USB charging stations can help you avoid potential risks. When traveling, be sure to pack AC chargers, car chargers, and your own USB cables. By relying on your own charging equipment, you eliminate the need to connect to potentially compromised public charging stations.

2. Carry an External Battery

Carrying an external battery, also known as a power bank, allows you to charge your devices without relying on public charging stations. These portable batteries provide a convenient and secure way to keep your devices powered up while on the go.

3. Consider a Charging-Only Cable

A charging-only cable is a protective attachment that prevents data from being sent or received while your device is charging. These cables are designed to block connections to the data-transfer pins in the USB male connection, ensuring that only the power pins are utilized. This safeguards your device from potential malware transmission while still allowing it to charge.

4. Avoid “Share Data” Prompts

When you plug your device into a USB port, you may encounter a prompt asking you to select “share data,” “trust this computer,” or “charge only.” Always choose the “charge only” option to prevent any data transfer between your device and the charging station. By disabling data sharing, you ensure that your device remains protected from potential malware transmission.

5. Be Cautious with Public Wi-Fi Networks

Public Wi-Fi networks can be another vulnerability that cyber criminals exploit to target travelers. Avoid connecting to unsecured networks, as they can be used to intercept your data or launch other types of attacks. If you must use public Wi-Fi, consider using a virtual private network (VPN) to encrypt your internet traffic and protect your sensitive information.

6. Keep Devices and Software Updated

Regularly updating your devices and software is crucial in maintaining their security. Manufacturers release updates to patch vulnerabilities and address security issues. By keeping your devices and software up to date, you ensure that you have the latest security features and protections against emerging threats.

7. Avoid Using Leftover Chargers

It’s best to avoid using chargers that are left plugged into outlets, especially in public spaces. These chargers can be compromised, and connecting your device to them puts you at risk of juice jacking. Instead, use your own charging equipment or seek out reputable charging stations that have been vetted for security.

8. Be Wary of Free Promotional Charging Devices

Be cautious when accepting free promotional charging devices or cables from unverified sources. These items may be compromised, and connecting your device to them can result in juice jacking. Stick to trusted suppliers and reputable brands when purchasing charging equipment.

9. Educate Yourself and Others

Spread awareness about the risks of juice jacking and educate others on how to protect themselves. By sharing this information, you can empower individuals to make informed decisions and avoid falling victim to this cyber threat. Encourage friends, family, and colleagues to follow the best practices outlined in this article.

10. Consider Using a USB Condom

A USB condom is a protective device that blocks data transfer while allowing your device to charge. It sits between your device’s charging cable and the public USB charging station, preventing any potential malware transmission. USB condoms ensure that only power is transferred, keeping your device secure.


As our reliance on portable devices continues to grow, it’s essential to be aware of the potential risks associated with charging your devices in public places. Juice jacking is a real cyber threat that can compromise your personal information and device security. By following the tips outlined in this article, you can significantly reduce the risk of falling victim to juice jacking and protect yourself and your devices. Stay vigilant, prioritize your security, and enjoy the convenience of portable technology without compromising your privacy and data. Interested in learning more about cybersecurity? This is just one of the many topics we teach at Northeast Technical Institute in our Cybersecurity Program. Learn more now!