>>> import nvdlib
>>> r = nvdlib.searchCVE(cveId='CVE-2021-26855')[0]
>>> print(r.v31severity + ' - ' + str(r.v31score))
CRITICAL - 9.8
>>> print(r.descriptions[0].value)
Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, 
CVE-2021-26854, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078.
>>> print(r.v31vector)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H