The weakness may arise in code, configuration or interactions between components. Its practical effect depends on the environment, the access available and the protections around the affected software.
Finding a suspected weakness is different from proving its impact in every deployment. Assessment should verify the relevant conditions, document the evidence and preserve clear boundaries around any testing.
ELI5
Think of a weakness in a program that may let something happen that its security rules should prevent.
For example, a service might expose information to an account that should not be able to read it, depending on how access checks are implemented.
Is every software bug a vulnerability?
No. A bug is a broader defect, while a vulnerability specifically has consequences for security requirements.
Does vulnerable software always mean a compromise occurred?
No. A weakness can exist without evidence that anyone used it or that the required conditions were present.
