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  5. CVE-2021-28363

CVE-2021-28363: Using default SSLContext for HTTPS requests in an HTTPS proxy doesn't verify certificate hostname for proxy connection

March 19, 2021 (updated November 18, 2024)

Users who are using an HTTPS proxy to issue HTTPS requests and haven’t configured their own SSLContext via proxy_config. Only the default SSLContext is impacted.

References

  • github.com/advisories/GHSA-5phf-pp7p-vc2r
  • github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2021-59.yaml
  • github.com/pypa/advisory-db/tree/main/vulns/urllib3/PYSEC-2021-59.yaml
  • github.com/urllib3/urllib3
  • github.com/urllib3/urllib3/blob/main/CHANGES.rst
  • github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0
  • github.com/urllib3/urllib3/commits/main
  • github.com/urllib3/urllib3/releases/tag/1.26.4
  • github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r
  • lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL
  • nvd.nist.gov/vuln/detail/CVE-2021-28363
  • pypi.org/project/urllib3/1.26.4
  • security.gentoo.org/glsa/202107-36
  • security.gentoo.org/glsa/202305-02
  • security.netapp.com/advisory/ntap-20240621-0007
  • www.oracle.com/security-alerts/cpuoct2021.html

Code Behaviors & Features

Detect and mitigate CVE-2021-28363 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions starting from 1.26.0 before 1.26.4

Fixed versions

  • 1.26.4

Solution

Upgrade to version 1.26.4 or above.

Impact 6.5 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-295: Improper Certificate Validation

Source file

pypi/urllib3/CVE-2021-28363.yml

Spotted a mistake? Edit the file on GitLab.

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