UBUNTU-CVE-2021-21419

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    UBUNTU-CVE-2021-21419

    Published: 7 May 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-21419
    Aliases:
    USN-4956-1

    Summary:

    Details: Eventlet is a concurrent networking library for Python. A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.

    References: https://ubuntu.com/security/CVE-2021-21419, https://ubuntu.com/security/notices/USN-4956-1, https://www.cve.org/CVERecord?id=CVE-2021-21419

    Affected packages

    Package

    Name: python-eventlet

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.25.1-2ubuntu1.1

    Affected versions

    0.25.0-0ubuntu1
    0.25.1-2build1
    0.25.1-2ubuntu1

    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-2021-21419 | CVE-DB