PSF-2022-7

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    PSF-2022-7

    Published: 4 Mar 2022Last Modified: 9 Oct 2025

    Summary: CVE-2021-3737: urllib HTTP client possible infinite loop on a 100 Continue response

    Details: A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.

    References: https://access.redhat.com/security/cve/CVE-2021-3737, https://bugzilla.redhat.com/show_bug.cgi?id=1995162, https://bugs.python.org/issue44022

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -078b146f062d212919d0ba25e34e658a8234aa63

    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