CompTIA CySA+ CS0-003 Practice Question

The most important factor for identifying a Zero-day vulnerability is whether it has no current patches or vendor fixes available. This is because Zero-day vulnerabilities are by definition unknown or unpatched vulnerabilities that can be actively exploited without available mitigation from the vendor. While factors such as known exploit availability or vendor remediation timelines are important for other types of vulnerabilities, they do not define Zero-day vulnerabilities.