What is a Zero Day Attack?

Sumit Singh
September 1, 2023


In today's increasingly digital world, threats to our information and systems are more present than ever. One such threat, a potent and often undetectable menace, is the “Zero Day Attack”. This term may sound ominous – and for good reason. So, what exactly is a zero day attack?

A zero day attack is a cyber-attack that exploits a vulnerability within software that is unknown to those who should be interested in its mitigation, including the software vendor. In other words, these attacks happen on “day zero” of awareness of the vulnerability, hence the term “zero day”.


A zero day attack involves three critical stages:

  1. Discovery: The attacker discovers a vulnerability within a system, application, or software before anyone else.
  2. Exploitation: The attacker develops code, commonly known as a zero day exploit, to target the vulnerability.
  3. Attack: The attacker launches the exploit, leading to potential unauthorised access, data theft, or damage.

The most daunting aspect of these attacks is their unpredictability. Without knowledge of the vulnerability, software vendors and cyber security teams are caught off guard, resulting in successful breaches and significant consequences.


  • Due to the stealthy nature of zero day attacks, reactive measures can often fall short – this is where Infotrust's Incident Response services shine. Our team of experts can help you create robust strategies to detect and respond to these attacks as rapidly as possible.
  • Additionally, Penetration Testing services are a highly recommended proactive approach to security. This process involves authorised simulated attacks on your systems to identify vulnerabilities before they can be exploited in a real-life scenario. In essence, this is like running a “fire drill” for your cybersecurity team, allowing them to prepare and learn from these simulations. However, no amount of pen testing will prevent a zero-day attack that exploits security vulnerabilities in unpatched apps and solutions. Simply keeping software up to date is a powerful line of defence in cybersecurity.  
  • It’s equally crucial to ensure your team understands the importance of patching and other basic security processes. Our Awareness Training services provide your team with the knowledge they need to identify and prevent potential attacks. Educating your workforce of their cybersecurity obligations is a vital step in the journey towards a more secure digital environment.


Understanding “what is a zero day attack” is crucial in today’s digital world. These attacks represent a serious and ever-present threat to your business’s security, and the key to mitigating them lies in a proactive approach.

By keeping your systems updated, educating your workforce, and simulating potential threats, you can significantly reduce your vulnerability to zero day attacks. Infotrust’s security services are designed to empower businesses with the tools they need to protect their digital assets effectively.

Contact us today to learn more about how we can help fortify your business against the threat of zero day attacks. Remember, in the world of cyber security, preparation is the most potent weapon you have.