Technology and tools
What is Vulnerability?
A weakness in software, hardware or configuration that an attacker could use to do something they should not be able to do.
A vulnerability is a weakness that could be used to break a system's security: a coding bug, a design flaw, a default password or a misconfiguration. Publicly disclosed software vulnerabilities usually receive a CVE identifier.
Not every vulnerability matters equally. What turns one into a priority is whether the affected product is present and reachable in your environment, how severe the impact is and whether attackers are actually exploiting it.