CVEvulnerability
CVE-2021-28363
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-03-15
- Last modified
- 2026-10-14
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CVSS 2.0 ([email protected])
- 6.4 MEDIUM — AV:N/AC:L/Au:N/C:P/I:P/A:N
- Weaknesses
- CWE-295
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.
Affected configurations
• python urllib3 (>= 1.26.0 < 1.26.4)
• fedoraproject fedora 34
• oracle peoplesoft enterprise peopletools 8.59
Related
Weakness · CWE (1)
- CWE-295 Improper Certificate Validation weakness
References
- https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0 Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/commits/main Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r Mitigation, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/ lists.fedoraproject.org
- https://pypi.org/project/urllib3/1.26.4/ Third Party Advisory
- https://security.gentoo.org/glsa/202107-36 Third Party Advisory
- https://security.gentoo.org/glsa/202305-02 security.gentoo.org
- https://security.netapp.com/advisory/ntap-20240621-0007/ security.netapp.com
- https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0 Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/commits/main Patch, Third Party Advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r Mitigation, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/ lists.fedoraproject.org
- https://pypi.org/project/urllib3/1.26.4/ Third Party Advisory
- https://security.gentoo.org/glsa/202107-36 Third Party Advisory
- https://security.gentoo.org/glsa/202305-02 security.gentoo.org
- https://security.netapp.com/advisory/ntap-20240621-0007/ security.netapp.com
- https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html cert-portal.siemens.com