PSF-2021-2

    Dashboard / Vulnerabilities / PSF-2021-2

    PSF-2021-2

    Published: 6 May 2021Last Modified: 9 Oct 2025

    Summary: ipaddress leading zeros in IPv4 address

    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://sick.codes/sick-2021-014

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -03dd89d62413c4a92831ed1b36e2ae8983bcb2d4

    Affected versions

    2.5

    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
    PSF-2021-2 | CVE-DB