CVE-2021-42343

moderate-risk

Published 2021-10-26

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.

Do I need to act?

3.7% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (1)

Dask

Affected Vendors

Anaconda

References (6)

Release Notes https://docs.dask.org/en/latest/changelog.html

Third Party Advisory https://github.com/dask/dask/tags

Third Party Advisory https://github.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxr

Release Notes https://docs.dask.org/en/latest/changelog.html

Third Party Advisory https://github.com/dask/dask/tags

Third Party Advisory https://github.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxr

/ 100

moderate-risk

Severity 32/34 · Critical

Exploitability 7/34 · Low

Exposure 5/34 · Minimal