Network Security Vulnerabilities A network security vulnerability is a weakness or flaw which can be exploited by a malicious actor to perform unauthorized actions within a computer system. Malware Statistics Malware, or malicious software, is any piece of software that was written with the intent of doing harm to data, devices or to people. Types of malware include computer viruses, trojans, spyware, ransomware, adware, worms, file-less malware, or hybrid attacks. Recent malware attacks have become more sophisticated with the advent of machine learning and targeted spear phishing emails.