Код:
import requests
from bs4 import BeautifulSoup
page = requests.get('https://nvd.nist.gov/vuln/detail/CVE-2019-9639')
soup = BeautifulSoup(page.text, 'html.parser')
vuln_description = soup.select('div.col-lg-9:nth-child(1) > p:nth-child(2)')
print(vuln_description)