CVE-2021-28363

medium

Description

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.

References

Advisories
More

https://www.oracle.com/security-alerts/cpuoct2021.html

https://security.gentoo.org/glsa/202305-02

https://security.gentoo.org/glsa/202107-36

https://pypi.org/project/urllib3/1.26.4/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/

https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r

https://github.com/urllib3/urllib3/commits/main

https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0

https://security.netapp.com/advisory/ntap-20240621-0007/

Details

Source: Mitre, NVD

Published: 2021-03-15

Updated: 2024-11-21

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Severity: Medium

CVSS v4

Base Score: 6.9

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00134