BIT-libpython-2021-29921

    Dashboard / Vulnerabilities / BIT-libpython-2021-29921

    BIT-libpython-2021-29921

    Published: 11 Aug 2025Last Modified: 8 Sept 2026

    Summary:

    Details: In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.

    References: https://bugs.python.org/issue36384, https://docs.python.org/3/library/ipaddress.html, https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst, https://github.com/python/cpython/pull/12577, https://github.com/python/cpython/pull/25099, https://github.com/sickcodes, https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md, https://nvd.nist.gov/vuln/detail/CVE-2021-29921, https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html, https://security.gentoo.org/glsa/202305-02, https://security.netapp.com/advisory/ntap-20210622-0003/, https://sick.codes/sick-2021-014, https://www.oracle.com//security-alerts/cpujul2021.html, https://www.oracle.com/security-alerts/cpuapr2022.html, https://www.oracle.com/security-alerts/cpujan2022.html, https://www.oracle.com/security-alerts/cpujul2022.html, https://www.oracle.com/security-alerts/cpuoct2021.html, https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html

    Affected packages

    Package

    Name: libpython

    Purl: pkg:bitnami/libpython

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 3.8.0
    Fixed -3.8.12

    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
    BIT-libpython-2021-29921 | CVE-DB