How Dangerous is a Zero Click Attack?

From data breaches to ransomware attacks, the stakes have never been higher for individuals and organizations. However, amid the vast array of threats, one type stands out due to its silent yet devastating nature: the Zero Click attack.

Understanding the implications of Zero Click attacks is paramount for tech enthusiasts and everyone who owns a digital device. Let's discover the intricacies of these attacks, their potential dangers, and how we can arm ourselves against them. 

What is a Zero Click attack?

A Zero Click attack, as the name implies, is a type of cyber attack that requires no direct interaction from the targeted user. Because of this, victims remain unaware of anything amiss, and therein lies the actual danger.

Traditional hacks often employ phishing emails, suspicious attachments, or compromised websites to deceive users into granting unauthorized access. These tactics rely on manipulating human behavior, exploiting our curiosity, fear, or trust. 

How a Zero Click Attack Works

Zero Click attacks primarily target vulnerabilities in software's background processes. Attackers with knowledge of vulnerabilities in these processes can craft specific payloads that, when processed, can cause unintended behaviors or give malicious access.

For instance, a flaw in how an operating system processes image files might allow an attacker to send a specifically crafted image via MMS. Once the device tries to process this image, the attacker gains unauthorized access.

If a hacker crafts this message in a specific way to exploit a vulnerability, it could allow unauthorized access, and all of this happens without the user even viewing or opening the message.

What Makes Zero Click Attacks Possible?

The sophistication of Zero Click attacks is rooted in their ability to exploit the fundamental processes and functionalities of devices and software. Since all devices must have one or several of these processes, there are multiple opportunities for Zero Click attacks.

Vulnerabilities in Communication Protocols

Modern devices communicate through various protocols, be it Bluetooth, Wi-Fi, NFC, or others. These protocols, although designed with security in mind, are not impervious. Hackers often find weaknesses in these protocols, allowing them to send malicious payloads or hijack sessions. 

A notable example is the BlueBorne attack, which exploited vulnerabilities in the Bluetooth protocol, potentially affecting billions of devices.

Software Stack Complexity

Modern software comprises multiple layers. Each layer is responsible for different functionalities. These layers interact with one another, often passing data back and forth. 

Through reverse engineering, an attacker can pinpoint areas where these interactions are not securely handled, providing an avenue for injecting malicious code or commands.

Update Mechanisms

While updates are meant to fix vulnerabilities and enhance security, the very mechanism through which devices receive updates can sometimes be exploited. Hackers who can intercept or mimic a software update can potentially push malicious updates to unsuspecting users.

Third-party Libraries and Components

Most software developers rely on third-party libraries and components to speed up development. While these libraries offer convenience, they also come with their own set of vulnerabilities. 

If hackers discover a flaw in a widely used library, they can exploit multiple apps or systems that depend on it.

Dangers of Zero Click Attacks: What Can Go Wrong?

As with most malware, there are many risks of being targeted by Zero Click attacks. Remember, these attacks are especially sinister because they sidestep the user's involvement, making them one of the stealthiest cyber threats.

Risks of Zero Click attacks include;

Unauthorized Access to Your Data

One of the foremost risks of zero-click attacks is the unauthorized extraction of personal and sensitive data. Given that no user interaction is required, an attacker can silently siphon off information such as contact details, photos, messages, and financial data. 

For businesses, this could mean the loss of trade secrets, customer databases, or proprietary information.

Zero Click attacks Bypass Traditional Security Measures

Conventional security measures, like firewalls and anti-malware software, are designed to detect and prevent threats that arise from user interactions, such as downloading malicious files. 

Zero Click attacks, however, can bypass these defenses by exploiting inherent system vulnerabilities, rendering traditional security tools ineffective in some cases.

Hackers Can Hijack Your Devices

Zero Click attacks can grant hackers complete control over a device. This means they can alter system settings, disable security features, install malicious software, or use the device as a launching pad for further attacks. 

Such control can be especially detrimental if the compromised device is a part of critical infrastructure, like power grids or transportation systems.

You May End Up Spreading Malware

Traditionally, spreading malware or ransomware required some form of user error—clicking on a dubious link, for instance. However, with Zero Click attacks, attackers can use your devices and systems to do this without your knowledge.

How to Prevent a Zero Click Attack

As daunting as Zero Click attacks may appear, there are ways that you can significantly reduce the risk of getting infected. Since you now know the dangers of a Zero Click attack, consider implementing some of these processes;

Regular Software Updates and Patches

Ensuring that all software remains up-to-date is of paramount importance. Developers frequently release patches to remedy vulnerabilities that could be targeted for Zero Click attacks. 

Consistently updating operating systems, applications, and firmware guarantees that known vulnerabilities get addressed.

Advanced Threat Detection Systems

Conventional anti-malware tools need to improve at detecting Zero Click attacks. Therefore, adopting advanced threat detection systems that leverage heuristics, behavioral analysis, and artificial intelligence can assist.

Examples of these include:

Regular Backups

Carrying out regular backups of vital data ensures that restoration is expedited and less disruptive in the face of a compromise. Testing these backups periodically to validate their integrity and functionality is equally crucial.

Some backup systems to consider include;

Two-Factor Authentication

Implementing Two-Factor Authentication (2FA) provides an additional layer of security for online accounts. Even if a hacker can get a password, they still require a secondary code to access the account. 

You should enable 2FA wherever possible, especially for critical accounts like email, banking, and social media.

Be Wary of Unsolicited Communications

Phishing attacks can sometimes be precursors or components of Zero Click Attacks. Even if no direct action, like clicking a link, is required, a well-crafted malicious message might trigger curiosity or fear, leading to unintended consequences.

Who is at Risk for Zero Click attacks?

Zero Click attacks are emerging as one of the most menacing threats in the cybersecurity landscape. But who stands in the line of fire for these intrusions? One might think it would be companies, but history indicates that individuals like us are most at risk.

For example, notable Zero Click Attacks include;

WhatsApp Vulnerability: Hackers exploited a vulnerability in WhatsApp's voice calling feature to install surveillance software on iOS and Android devices, all without the recipient answering the call.

iMessage Vulnerability: Apple's iMessage service had a flaw that allowed hackers to access iPhones remotely. This exploit was deemed so dangerous that Google's Project Zero, a team dedicated to finding security vulnerabilities, announced it before Apple had fully patched it.

Android's ‘StrandHogg': A vulnerability in Android OS allowed malicious apps to masquerade as legitimate ones, accessing users' private data without their knowledge.

While it's tempting to believe that only high-profile targets like celebrities, politicians, or business magnates are at risk, the reality is that virtually everyone is susceptible. However, specific segments face heightened risks:

  • High-Profile Individuals
  • Business Executives
  • Government Employees
  • Research and Academic Personnel
  • Military Personnel


Whether you're a high-profile individual, a business executive, or an average consumer, the risk of any malware is real and ever-present. The digital age has brought countless benefits but demands our vigilance to protect our data and privacy. 

We can navigate this digital era more safely and confidently by staying informed, updating and upgrading security measures, and practicing good digital hygiene.

Timothy Shim

Tim is a former tech journalist turned web technology junkie. He spends his time exploring the best in digital privacy and security tools. Meanwhile, experiments with SEO continue to increase his blood pressure. ( Contact Tim on Linkedin )

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