A vulnerability is a weakness or flaw in software, an IT system, a network or a device. If discovered by a cybercriminal, it can be exploited to bypass existing security measures and carry out a cyberattack.
A vulnerability can have several different causes. It may result from an error in software development, a misconfiguration, an outdated system or obsolete equipment. Some vulnerabilities remain unknown for months or even years before they are discovered.
Take a simple example: software used by a company contains a flaw that allows an external person to access certain data without having the necessary permissions.
A cybercriminal who discovers this weakness may try to exploit it to steal information, install malware, take control of a system or prepare a larger attack, such as ransomware.
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When a vulnerability is discovered, the software vendor will generally release a security fix, also known as a patch. It is therefore essential for companies to keep their software and devices up to date. The longer a known vulnerability remains unpatched, the greater the opportunity it can present to attackers.
Some publicly known vulnerabilities are listed in the CVE (Common Vulnerabilities and Exposures) system, which assigns them a unique identifier to make them easier for cybersecurity professionals to track.
Vulnerability management is therefore an essential part of a cybersecurity strategy. It involves regularly identifying weaknesses, assessing their level of risk and applying the necessary patches. The objective is not to wait for a vulnerability to be exploited, but to fix it before it can become the entry point for a cyberattack.