How does Nessus detect CVE's in scans

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how does Nessus scanner write plugins for the latest CVE’s that don’t have a public exploit? in order to identify the vulnerabilities in the network. does it do banner matching with the available CVE ?

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In some cases a version check will be done using either local or remote detection to verify if the target version is vulnerable.

In other cases a security researcher will work on developing a proof of concept based on the vulnerability description.