Definition
Exploit
In one sentence
An exploit is code, a technique or a sequence of actions that takes advantage of a vulnerability to make a system behave in a way its designers did not intend, such as running attacker code or bypassing authentication.
Exploit Explained
A vulnerability is the weakness; an exploit is how it gets used. Once a working exploit for a popular product is published or sold, the window between disclosure and mass attacks can shrink to days. Criminal groups automate scanning for vulnerable systems and run exploits against everything they find.
Exploit availability is one of the best signals for prioritizing patches. A vulnerability with a public proof-of-concept or confirmed exploitation in the wild deserves urgent attention, particularly on internet-facing devices such as firewalls, VPN gateways, remote access tools and web applications.
For a small business, you do not need to track exploits yourself. Rely on vendor advisories, alerts from the Canadian Centre for Cyber Security and lists such as the U.S. CISA Known Exploited Vulnerabilities catalogue, ideally through a vulnerability management service that does this for you. Penetration testers use exploits under controlled conditions to show which weaknesses in your environment are genuinely dangerous rather than theoretical.
General information for Canadian organizations, not legal advice.