Go to https://cve.mitre.org. What type of site is this, and what information can it provide? Now,

paste in the URL then click Search CVE List, and enter "Ransomware"

https://cve.mitre.org/cve, in the search field. Click Search again. What information is provided? How would this be useful?

Click on one of the named results. What additional information is provided? How could this be useful?