{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-24031 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-24031 is a medium-severity vulnerability in Facebook Zstandard, published on 4 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-24031 and fix it if it is affected.\n\nWhat it is: CVE-2021-24031 is a medium-severity vulnerability in Facebook Zstandard, published on 4 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-24031 in the wild and no public exploit code.\n\nAffected product: Facebook Zstandard. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2021-24031/ (Markdown: https://insights.sbomify.com/CVE-2021-24031/index.md)","id":"CVE-2021-24031","markdown":"https://insights.sbomify.com/CVE-2021-24031/index.md","name":"CVE-2021-24031","record":{"aliases":["ALPINE-CVE-2021-24031","CLEANSTART-2025-NH78236","DEBIAN-CVE-2021-24031","DLA-2573-1","DSA-4850-1","GHSA-5mqj-v3fr-pg3x","MGASA-2021-0322","UBUNTU-CVE-2021-24031"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Zstandard compression library","requires_auth":"low_privilege","summary":"Local attackers can read or modify Zstandard output files due to insecure default permissions before completion.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"facebook","cpe":[{"product":"zstandard","vendor":"facebook"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-276","name":"Incorrect Default Permissions"},{"id":"CWE-277","name":"Insecure Inherited Permissions"}],"description":"In the Zstandard command-line utility prior to v1.4.1, output files were created with default permissions. Correct file permissions (matching the input) would only be set at completion time. Output files could therefore be readable or writable to unintended parties.","ecosystems":[],"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":"Information disclosure in Zstandard","id":"CVE-2021-24031","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Information disclosure in Zstandard","id":"CVE-2021-24032"},"packages":[],"prev":{"headline":"Command injection in Facebook Gameroom","id":"CVE-2021-24030"},"products":["Zstandard"],"published":"2021-03-04","related":[{"cvss_score":8.1,"headline":"Race condition in Zstandard","id":"CVE-2019-11922","kev_date_added":null,"published":"2019-07-25"},{"cvss_score":7.5,"headline":"zstd vulnerable to buffer overrun","id":"CVE-2022-4899","kev_date_added":null,"published":"2023-03-31"},{"cvss_score":4.7,"headline":"Information disclosure in Zstandard","id":"CVE-2021-24032","kev_date_added":null,"published":"2021-03-04"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Facebook"]},"summary":"Local attackers can read or modify Zstandard output files due to insecure default permissions before completion.","url":"https://insights.sbomify.com/CVE-2021-24031/"}