{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-40083 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-40083 is a high-severity denial of service vulnerability in n/a, published on 25 Aug 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-2021-40083 and fix it if it is affected.\n\nWhat it is: CVE-2021-40083 is a high-severity denial of service vulnerability in n/a, published on 25 Aug 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-2021-40083 in the wild and no public exploit code.\n\nAffected product: n/a. 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-2021-40083/ (Markdown: https://insights.sbomify.com/CVE-2021-40083/index.md)","id":"CVE-2021-40083","markdown":"https://insights.sbomify.com/CVE-2021-40083/index.md","name":"CVE-2021-40083","record":{"aliases":["DEBIAN-CVE-2021-40083","GHSA-wvjr-27w9-ff2r"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS resolver","requires_auth":"none","summary":"A remote attacker can cause a denial of service in Knot Resolver by triggering an assertion failure via crafted NSEC3 records.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"knot_resolver","vendor":"nic"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-617","name":"Reachable Assertion"}],"description":"Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used for a positive wildcard proof).","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":"Denial of service in n/a","id":"CVE-2021-40083","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Command injection in n/a","id":"CVE-2021-40084"},"packages":[],"prev":{"headline":"Missing authorization in NetMotion Mobility","id":"CVE-2021-40067"},"products":["n/a"],"published":"2021-08-25","related":[{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-46317","kev_date_added":null,"published":"2023-10-22"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-26249","kev_date_added":null,"published":"2023-02-21"},{"cvss_score":7.5,"headline":"Denial of service in knot-resolver","id":"CVE-2018-1110","kev_date_added":null,"published":"2021-03-30"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2020-12667","kev_date_added":null,"published":"2020-05-19"},{"cvss_score":7.5,"headline":"Other in knot-resolver","id":"CVE-2018-10920","kev_date_added":null,"published":"2018-08-02"},{"cvss_score":5.3,"headline":"Other in n/a","id":"CVE-2022-32983","kev_date_added":null,"published":"2022-06-20"}],"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":"2024-08-04","vendors":["n/a"]},"summary":"A remote attacker can cause a denial of service in Knot Resolver by triggering an assertion failure via crafted NSEC3 records.","url":"https://insights.sbomify.com/CVE-2021-40083/"}