Improper Certificate Validation Affecting python-urllib3 package, versions <1.26.4-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.13% (35th percentile)

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  • Snyk IDSNYK-DEBIAN13-PYTHONURLLIB3-5693202
  • published16 Mar 2021
  • disclosed15 Mar 2021

Introduced: 15 Mar 2021

CVE-2021-28363  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade Debian:13 python-urllib3 to version 1.26.4-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-urllib3 package and not the python-urllib3 package as distributed by Debian. See How to fix? for Debian:13 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1