Which of the following is not a common type of cybersecurity threat?

Hardware failure is not considered a common type of cybersecurity threat because it pertains to physical malfunctions of devices rather than intentional attacks or exploits. Cybersecurity threats typically involve malicious actions aimed at compromising data integrity, confidentiality, or availability.

Social engineering, malware, and phishing are all actively engaged tactics used by cybercriminals to deceive users and exploit vulnerabilities in systems or information.

Social engineering involves manipulating individuals into divulging confidential information, often through psychological tricks. Malware refers to any software intentionally designed to cause damage to a computer, server, or network, while phishing is a specific technique where attackers attempt to deceive users into providing sensitive information by masquerading as a trustworthy entity. These types of threats rely on exploiting human behavior or system vulnerabilities, which distinguishes them from the aspect of hardware failure that is merely an operational hiccup without malicious intent.