CVE-2021-28363

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 34%
VendorProductVersion
pythonurllib3
1.26.0 ≤
𝑥
< 1.26.4
oraclepeoplesoft_enterprise_peopletools
8.59
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
python-urllib3
bullseye
1.26.5-1~exp1
fixed
buster
not-affected
stretch
not-affected
bookworm
1.26.12-1
fixed
sid
2.0.7-2
fixed
trixie
2.0.7-2
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
python-pip
groovy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
not-affected
python-urllib3
groovy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
not-affected
Common Weakness Enumeration
References
https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0
https://github.com/urllib3/urllib3/commits/main
https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/
https://pypi.org/project/urllib3/1.26.4/
https://security.gentoo.org/glsa/202107-36
https://security.gentoo.org/glsa/202305-02
https://security.netapp.com/advisory/ntap-20240621-0007/
https://www.oracle.com/security-alerts/cpuoct2021.html
https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0
https://github.com/urllib3/urllib3/commits/main
https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/
https://pypi.org/project/urllib3/1.26.4/
https://security.gentoo.org/glsa/202107-36
https://security.gentoo.org/glsa/202305-02
https://security.netapp.com/advisory/ntap-20240621-0007/
https://www.oracle.com/security-alerts/cpuoct2021.html