UBUNTU-CVE-2021-3737

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    UBUNTU-CVE-2021-3737

    Published: 31 Aug 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3737
    Aliases:
    USN-5083-1
    USN-5199-1
    USN-5200-1

    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://ubuntu.com/security/CVE-2021-3737, https://bugs.python.org/issue44022, https://github.com/python/cpython/pull/25916, https://github.com/python/cpython/pull/26503, https://github.com/python/cpython/commit/60ba0b68470a584103e28958d91e93a6db37ec92, https://github.com/python/cpython/commit/ea9327036680acc92d9f89eaf6f6a54d2f8d78d9, https://github.com/python/cpython/commit/f396864ddfe914531b5856d7bf852808ebfc01ae, https://github.com/python/cpython/commit/078b146f062d212919d0ba25e34e658a8234aa63, https://github.com/python/cpython/commit/f68d2d69f1da56c2aea1293ecf93ab69a6010ad7, https://github.com/python/cpython/commit/98e5a7975d99b58d511f171816ecdfb13d5cca18, https://github.com/python/cpython/commit/5df4abd6b033a5f1e48945c6988b45e35e76f647, https://github.com/python/cpython/commit/0389426fa4af4dfc8b1d7f3f291932d928392d8b, https://github.com/python/cpython/commit/fee96422e6f0056561cf74fef2012cc066c9db86, https://github.com/python/cpython/commit/1b6f4e5e13ebd1f957b47f7415b53d0869bdbac6, https://ubuntu.com/security/notices/USN-5083-1, https://ubuntu.com/security/notices/USN-5199-1, https://ubuntu.com/security/notices/USN-5200-1, https://ubuntu.com/security/notices/USN-5201-1, https://www.cve.org/CVERecord?id=CVE-2021-3737, https://ubuntu.com/security/notices/USN-6891-1

    Affected packages

    Package

    Name: python3.4

    Purl: pkg:deb/ubuntu/[email protected]~14.04.7+esm11?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.4.3-1ubuntu1~14.04.7+esm11

    Affected versions

    3.4~b1-0ubuntu3

    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-2021-3737 | CVE-DB