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CVE
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CVE-2021-28363Date: (C)2021-03-16   (M)2023-12-22


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 Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 6.5CVSS Score : 6.4
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 2.5Impact Score: 4.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: PARTIAL
Confidentiality: LOWAvailability: NONE
Integrity: LOW 
Availability: NONE 
  
Reference:
FEDORA-2021-3f378dda90
GLSA-202107-36
GLSA-202305-02
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://pypi.org/project/urllib3/1.26.4/
https://www.oracle.com/security-alerts/cpuoct2021.html

CWE    1
CWE-295
OVAL    3
oval:org.secpod.oval:def:120245
oval:org.secpod.oval:def:1700797
oval:org.secpod.oval:def:1700637

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