Glossary
CVE
A public identifier for a specific security flaw.
CVE stands for Common Vulnerabilities and Exposures. Each publicly known flaw gets an identifier such as CVE-2021-41773, so that scanners, vendors and defenders talk about the same thing.
A CVE says which flaw it is. It does not say how severe it is or whether anyone is using it. Those come from other sources, such as CVSS, EPSS and the CISA KEV catalog.