DEBIAN-CVE-2021-28363

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    DEBIAN-CVE-2021-28363

    Published: 15 Mar 2021Last Modified: 1 Sept 2026
    Upstream:
    CVE-2021-28363

    Summary:

    Details: 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.

    References: https://security-tracker.debian.org/tracker/CVE-2021-28363

    Affected packages

    Package

    Name: python-urllib3

    Purl: pkg:deb/debian/python-urllib3?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.26.4-1

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    DEBIAN-CVE-2021-28363 | CVE-DB