CVE-2021-21419

    Dashboard / Vulnerabilities / CVE-2021-21419

    CVE-2021-21419

    Published: 7 May 2021Last Modified: 8 Jul 2026

    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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2WJFSBPLCNSZNHYQC4QDRDFRTEZRMD2L/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5JZP4LZOSP7CUAM3GIRW6PIAWKH5VGB/, https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- b0969fc156700b84eefa554bea65088486c104de
    Fixed -f717f382d0bfb5cf084a9e69737fa6dfcb2eb5cf

    Affected versions

    v0.30.3
    v0.30.2
    v0.30.1
    v0.30.0

    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-2021-21419 | CVE-DB