UBUNTU-CVE-2021-33571

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    UBUNTU-CVE-2021-33571

    Published: 2 Jun 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-33571
    Aliases:
    USN-4975-1

    Summary:

    Details: In Django 2.2 before 2.2.24, 3.x before 3.1.12, and 3.2 before 3.2.4, URLValidator, validate_ipv4_address, and validate_ipv46_address do not prohibit leading zero characters in octal literals. This may allow a bypass of access control that is based on IP addresses. (validate_ipv4_address and validate_ipv46_address are unaffected with Python 3.9.5+..) .

    References: https://ubuntu.com/security/CVE-2021-33571, https://www.djangoproject.com/weblog/2021/jun/02/security-releases/, https://ubuntu.com/security/notices/USN-4975-1, https://www.cve.org/CVERecord?id=CVE-2021-33571

    Affected packages

    Package

    Name: python-django

    Purl: pkg:deb/ubuntu/python-django@2:2.2.12-1ubuntu0.7?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:2.2.12-1ubuntu0.7

    Affected versions

    1:1.11.22-1ubuntu1

    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
    UBUNTU-CVE-2021-33571 | CVE-DB