{"answers":{"affected":"6 open source packages ship an affected version, including dask and distributed. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-42343 in the wild and no public exploit code.","fix":"Upgrade dask to 2021.10.0 or later.","what":"CVE-2021-42343 is a critical vulnerability in n/a, published on 26 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-42343 and fix it if it is affected.\n\nWhat it is: CVE-2021-42343 is a critical vulnerability in n/a, published on 26 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-42343 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- dask (PyPI): affected all versions; fixed in 2021.10.0\n- dask (PyPI): affected all versions; fixed in 2021.10.0\n- dask (PyPI): affected all versions; fixed in 2021.10.0\n- distributed (PyPI): affected all versions; fixed in 2021.10.0\n- distributed (PyPI): affected all versions; fixed in 2021.10.0\n- distributed (PyPI): affected all versions; fixed in 2021.10.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-42343/ (Markdown: https://insights.sbomify.com/CVE-2021-42343/index.md)","id":"CVE-2021-42343","markdown":"https://insights.sbomify.com/CVE-2021-42343/index.md","name":"CVE-2021-42343","record":{"aliases":["DEBIAN-CVE-2021-42343","GHSA-hwqr-f3v9-hwxr","GHSA-j8fq-86c5-5v2r","PYSEC-2021-387","PYSEC-2021-871","UBUNTU-CVE-2021-42343","openSUSE-SU-2024:11766-1","openSUSE-SU-2024:13920-1","openSUSE-SU-2026:11043-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Dask distributed library","requires_auth":"none","summary":"Dask LocalCluster workers incorrectly listen on external interfaces, allowing remote attackers to achieve code execution on exposed ports.","user_interaction":"not_required","vuln_class":"misconfiguration"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"dask","vendor":"anaconda"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"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.","ecosystems":["PyPI","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Workers for local Dask clusters mistakenly listened on public interfaces","id":"CVE-2021-42343","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"misconfiguration","year":"2021"},"n_packages":9,"n_references":3,"next":{"headline":"DOM based XSS Vulnerability in Apache Knox","id":"CVE-2021-42357"},"packages":[{"ecosystem":"PyPI","fixed":["2021.10.0"],"introduced":["0"],"last_affected":[],"package":"dask","purl":null,"source":"GHSA-j8fq-86c5-5v2r"},{"ecosystem":"PyPI","fixed":["2021.10.0"],"introduced":["0"],"last_affected":[],"package":"dask","purl":"pkg:pypi/dask","source":"GHSA-j8fq-86c5-5v2r"},{"ecosystem":"PyPI","fixed":["2021.10.0"],"introduced":["0"],"last_affected":[],"package":"dask","purl":"pkg:pypi/dask","source":"PYSEC-2021-387"},{"ecosystem":"PyPI","fixed":["2021.10.0"],"introduced":["0"],"last_affected":[],"package":"distributed","purl":null,"source":"GHSA-hwqr-f3v9-hwxr"},{"ecosystem":"PyPI","fixed":["2021.10.0"],"introduced":["0"],"last_affected":[],"package":"distributed","purl":"pkg:pypi/distributed","source":"GHSA-hwqr-f3v9-hwxr"},{"ecosystem":"PyPI","fixed":["2021.10.0"],"introduced":["0"],"last_affected":[],"package":"distributed","purl":"pkg:pypi/distributed","source":"PYSEC-2021-871"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["2022.1.0-1.1"],"introduced":["0"],"last_affected":[],"package":"python-distributed","purl":"pkg:rpm/opensuse/python-distributed\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2024:11766-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["2024.4.2-1.1"],"introduced":["0"],"last_affected":[],"package":"python-distributed","purl":"pkg:rpm/opensuse/python-distributed\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2024:13920-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["2026.6.0-1.1"],"introduced":["0"],"last_affected":[],"package":"python-distributed","purl":"pkg:rpm/opensuse/python-distributed\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11043-1"}],"prev":{"headline":"File upload in n/a","id":"CVE-2021-42342"},"products":["n/a"],"published":"2021-10-26","related":[{"cvss_score":5.3,"headline":"Dask distributed Vulnerable to Remote Code Execution via Jupyter Proxy and Dashboard","id":"CVE-2026-23528","kev_date_added":null,"published":"2026-01-16"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"Dask LocalCluster workers incorrectly listen on external interfaces, allowing remote attackers to achieve code execution on exposed ports.","url":"https://insights.sbomify.com/CVE-2021-42343/"}