medium
5.3
CWE
400
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2021-21419: Improper Handling of Highly Compressed Data (Data Amplification) and Memory Allocation with Excessive Size Value in eventlet

First published: Thu May 06 2021(Updated: )

### Impact 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. ### Patches Version 0.31.0 restricts websocket frame to reasonable limits. ### Workarounds Restricting memory usage via OS limits would help against overall machine exhaustion. No workaround to protect Eventlet process. ### For more information If you have any questions or comments about this advisory: * Open an issue in [eventlet](https://github.com/eventlet/eventlet/issues) * Contact current maintainers. At 2021-03: temotor@gmail.com or https://t.me/temotor

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
redhat/python-eventlet<0:0.25.2-4.el8
0:0.25.2-4.el8
redhat/python-eventlet<0:0.25.2-5.el8
0:0.25.2-5.el8
Eventlet Eventlet>=0.10<0.31.0
Fedoraproject Fedora=33
Fedoraproject Fedora=34
redhat/eventlet<0.31.0
0.31.0
pip/eventlet>=0.10<0.31.0
0.31.0
Fedora=33
Fedora=34

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2021-21419?

    CVE-2021-21419 has a medium severity rating due to the potential for memory exhaustion from large websocket frames.

  • How do I fix CVE-2021-21419?

    To fix CVE-2021-21419, upgrade to Eventlet version 0.31.0 or later.

  • What types of software are affected by CVE-2021-21419?

    CVE-2021-21419 affects Eventlet versions prior to 0.31.0, primarily in applications using Python with Eventlet.

  • Can CVE-2021-21419 be exploited remotely?

    Yes, CVE-2021-21419 can be exploited remotely by a malicious websocket peer sending oversized frames.

  • What is the impact of CVE-2021-21419 on systems?

    The impact of CVE-2021-21419 is significant memory exhaustion on the Eventlet side, potentially leading to denial of service.

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