How exploit works
A vulnerability is a weakness; an exploit is the method that uses it. For a software flaw such as a memory error or injection weakness, the exploit sends specially crafted input that causes the program to run attacker-chosen code or reveal data.
Exploits are often packaged into frameworks or malware so they can be reused at scale. They may be delivered remotely over a network, through a malicious document or website, or locally by a user who already has limited access and wants more privileges. Exploits differ in reliability and reach: some need user interaction, some work remotely without credentials, and some only help an attacker who is already logged in.
Why it matters for Canadian organizations
Attackers frequently begin exploiting newly published vulnerabilities soon after details become public, so the time between disclosure and patching is a real exposure window. Internet-facing systems such as VPNs, firewalls and web applications are common targets.
The Canadian Centre for Cyber Security publishes alerts about actively exploited flaws. Failing to apply known fixes can weaken an organization's position when assessing whether it took reasonable safeguards under PIPEDA or Law 25 after a breach. Security teams track exploit availability and active use when ranking patches, because a flaw with a public working exploit deserves faster attention than one that is only theoretical.
How to defend against it
Reduce exposure by keeping an accurate asset inventory, patching quickly with priority on internet-facing systems, and removing services you do not need. Use vulnerability scanning to find weaknesses before attackers do.
Add compensating controls where patching is slow: segmentation, web application firewalls, endpoint protection that detects exploit behaviour, and penetration testing to confirm that real attack paths are closed. Regularly rehearse how you would patch an actively exploited flaw outside the normal maintenance window, including who approves the emergency change and how you verify success.
Frequently asked questions
What is the difference between a vulnerability and an exploit?
A vulnerability is a flaw or weakness in software, hardware or process. An exploit is the specific method or code that takes advantage of that flaw. A vulnerability can exist for years without a working exploit, but once one appears, risk rises sharply.
Is an exploit the same as malware?
Not exactly. An exploit is the means of getting in or gaining control, while malware is the malicious software that does the damage afterward. Attackers often combine them, using an exploit to deliver and run malware on the target.
What is an exploit kit?
An exploit kit is a toolkit that automatically scans a victim's software for known vulnerabilities and uses matching exploits to compromise it, often through malicious or compromised websites. Keeping browsers and plugins patched greatly reduces the chance of success.
Related service: Offensive security testing