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CVE-2021-42343

9.8 · CRITICAL

An issue was discovered in the Dask distributed package before 2021.10.0 for Python.

Published Oct 26, 2021EPSS 2.98%

Overview

CVE-2021-42343 is a critical-severity vulnerability. It was published on October 26, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered in the Dask distributed package before 2021.10.0 for Python. Single machine Dask clusters started with dask.distributed.LocalCluster or dask.distributed.Client (which defaults to using LocalCluster) would mistakenly configure their respective Dask workers to listen on external interfaces (typically with a randomly selected high port) rather than only on localhost. A Dask cluster created using this method (when running on a machine that has an applicable port exposed) could be used by a sophisticated attacker to achieve remote code execution.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocs.dask.org/en/latest/changelog.htmlGitHubgithub.com/dask/dask/tagsGitHubgithub.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxrRefdocs.dask.org/en/latest/changelog.htmlGitHubgithub.com/dask/dask/tagsGitHubgithub.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxr

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42343?

CVE-2021-42343 is a critical-severity vulnerability. It was published on October 26, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2021-42343?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-42343?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-42343?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42343 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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