CVE-2021-3737

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    CVE-2021-3737

    Published: 4 Mar 2022Last Modified: 20 Oct 2026

    Summary:

    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://cert-portal.siemens.com/productcert/html/ssa-398330.html, https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html, https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html, https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html, https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html, https://security.netapp.com/advisory/ntap-20220407-0009/, https://bugs.python.org/issue44022, https://bugzilla.redhat.com/show_bug.cgi?id=1995162, https://github.com/python/cpython/pull/25916, https://github.com/python/cpython/pull/26503, https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html, https://ubuntu.com/security/CVE-2021-3737, https://www.oracle.com/security-alerts/cpujul2022.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 5c4568a05a0a62b5947c55f68f9f2ecfb90a4f12
    Fixed -9a0099d1bf14bce417370aae6d55527417cda354

    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
    CVE-2021-3737 | CVE-DB