VulnerabilityModified
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.
MEDIUM 6.5EPSS 2.11%
Does this matter?
Lower severity and a low EPSS score (2.11%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS
- 2.11% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-295
- Affected
- python/urllib3 · fedoraproject/fedora · oracle/peoplesoft enterprise peopletools
- Source
- cve@mitre.org
References
- https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/commits/mainPatch, Third Party Advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2rMitigation, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/
- https://pypi.org/project/urllib3/1.26.4/Third Party Advisory
- https://security.gentoo.org/glsa/202107-36Third Party Advisory
- https://security.gentoo.org/glsa/202305-02
- https://security.netapp.com/advisory/ntap-20240621-0007/
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/commits/mainPatch, Third Party Advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2rMitigation, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/
- https://pypi.org/project/urllib3/1.26.4/Third Party Advisory
- https://security.gentoo.org/glsa/202107-36Third Party Advisory
- https://security.gentoo.org/glsa/202305-02
- https://security.netapp.com/advisory/ntap-20240621-0007/
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.