CVE catalog
CVE-2021-42343
dask.distributed: CVE-2021-42343
- Severity
- Critical · CVSS 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 2.98% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | dask.distributed | sid | 2024.12.1+ds-3 | fixed |
| Debian | dask.distributed | forky | 2024.12.1+ds-3 | fixed |
| Debian | dask.distributed | trixie | 2024.12.1+ds-1 | fixed |
| Debian | dask.distributed | bookworm | 2022.12.1+ds.1-3 | fixed |
| Opensuse | python-distributed | tumbleweed | 2026.6.0-1.1 | fixed |
| Opensuse | python-distributed | tumbleweed | 2024.4.2-1.1 | fixed |
| Opensuse | python-distributed | tumbleweed | 2022.1.0-1.1 | fixed |
| Ubuntu | dask.distributed | 18.04 | 1.18.0+ds.1-1 | vulnerable |
| Ubuntu | dask.distributed | 18.04 | 1.20.2+ds.1-1 | vulnerable |
| Ubuntu | dask.distributed | 18.04 | 1.20.2+ds.1-2 | vulnerable |
| Ubuntu | dask.distributed | 20.04 | 1.25.0+ds.1-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | dask.distributed | source | sid | 2021.09.1+ds.1-2 | not yet assigned | Not reported | Not reported |
| Debian | dask.distributed | source | forky | 2021.09.1+ds.1-2 | not yet assigned | Not reported | Not reported |
| Debian | dask.distributed | source | trixie | 2021.09.1+ds.1-2 | not yet assigned | Not reported | Not reported |
| Debian | dask.distributed | source | bookworm | 2021.09.1+ds.1-2 | not yet assigned | Not reported | Not reported |
| Opensuse | python-distributed | rpm | tumbleweed | 2026.6.0-1.1 | Not reported | OPENSUSE-SU-2026:11043-1 | Not reported |
| Opensuse | python-distributed | rpm | tumbleweed | 2024.4.2-1.1 | Not reported | OPENSUSE-SU-2024:13920-1 | Not reported |
| Opensuse | python-distributed | rpm | tumbleweed | 2022.1.0-1.1 | Not reported | OPENSUSE-SU-2024:11766-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [python313-distributed]Unknown
Source package: [python-distributed]
Details (1)
2026.6.0-1.2· noarch · tumbleweedUnknown · Fixed:
2022.1.0-1.1, 2024.4.2-1.1, 2026.6.0-1.1Version impact unknown
dsa · python-distributed · opensuse · tumbleweed
- [python314-distributed]Unknown
Source package: [python-distributed]
Details (1)
2026.6.0-1.2· noarch · tumbleweedUnknown · Fixed:
2022.1.0-1.1, 2024.4.2-1.1, 2026.6.0-1.1Version impact unknown
dsa · python-distributed · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [python3-distributed]Fixed
Source package: [dask.distributed]
Details (2)
2022.12.1+ds.1-3· all · bookwormFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12
2022.12.1+ds.1-3· all · bookwormFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12
- [python-distributed-doc]Fixed
Source package: [dask.distributed]
Details (2)
2022.12.1+ds.1-3· all · bookwormFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12
2022.12.1+ds.1-3· all · bookwormFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · bookworm; dsa · dask.distributed · debian · 12
[Debian 13 (Trixie)]
- [python3-distributed]Fixed
Source package: [dask.distributed]
Details (2)
2024.12.1+ds-1· all · trixieFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · 13
2024.12.1+ds-1· all · trixieFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · 13
- [python-distributed-doc]Fixed
Source package: [dask.distributed]
Details (2)
2024.12.1+ds-1· all · trixieFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · 13
2024.12.1+ds-1· all · trixieFixed · Fixed:
2021.09.1+ds.1-2dsa · dask.distributed · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2024_11766-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-42343]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-42343]
- [https://osv.dev/vulnerability/openSUSE-SU-2024:11766-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2024:13920-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11043-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-42343]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]