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cvelistMitreCVELIST:CVE-2021-28363
HistoryMar 15, 2021 - 12:00 a.m.

CVE-2021-28363

2021-03-1500:00:00
mitre
www.cve.org
9
urllib3 library
ssl certificate validation
python

AI Score

6.8

Confidence

High

EPSS

0.001

Percentile

49.3%

The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn’t given via proxy_config) doesn’t verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted.