{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21281 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-21281 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-21281 is a high-severity memory corruption vulnerability in contiki-ng, published on 18 Jun 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-2021-21281 and fix it if it is affected.\n\nWhat it is: CVE-2021-21281 is a high-severity memory corruption vulnerability in contiki-ng, published on 18 Jun 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-2021-21281 in the wild and no public exploit code.\n\nAffected product: contiki-ng. 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-2021-21281/ (Markdown: https://insights.sbomify.com/CVE-2021-21281/index.md)","id":"CVE-2021-21281","markdown":"https://insights.sbomify.com/CVE-2021-21281/index.md","name":"CVE-2021-21281","record":{"aliases":[],"analysis":{"component_type":"operating_system","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"IoT operating system","requires_auth":"none","summary":"Remote attackers can trigger a buffer overflow in Contiki-NG via unvalidated TCP data offset, potentially leading to code execution or denial of service.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"contiki-ng","vendor":"contiki-ng"}],"cvss":{"score":7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H","version":"3.1"},"cwes":[{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"description":"Contiki-NG is an open-source, cross-platform operating system for internet of things devices. A buffer overflow vulnerability exists in Contiki-NG versions prior to 4.6. After establishing a TCP socket using the tcp-socket library, it is possible for the remote end to send a packet with a data offset that is unvalidated. The problem has been patched in Contiki-NG 4.6. Users can apply the patch for this vulnerability out-of-band as a workaround.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Buffer overflow due to unvalidated TCP data offset","id":"CVE-2021-21281","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Buffer overflow in RPL source routing header processing","id":"CVE-2021-21282"},"packages":[],"prev":{"headline":"Out-of-bounds write when processing 6LoWPAN extension headers","id":"CVE-2021-21280"},"products":["contiki-ng"],"published":"2021-06-18","related":[{"cvss_score":10,"headline":"Memory corruption in n/a","id":"CVE-2018-19417","kev_date_added":null,"published":"2018-11-21"},{"cvss_score":9.8,"headline":"Contiki-NG has off-by-one error in Antelope DBMS","id":"CVE-2023-30546","kev_date_added":null,"published":"2023-04-26"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-24336","kev_date_added":null,"published":"2020-12-11"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-14934","kev_date_added":null,"published":"2020-08-18"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-14935","kev_date_added":null,"published":"2020-08-18"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-14936","kev_date_added":null,"published":"2020-08-18"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2019-8359","kev_date_added":null,"published":"2020-04-23"}],"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":["contiki-ng"]},"summary":"Remote attackers can trigger a buffer overflow in Contiki-NG via unvalidated TCP data offset, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2021-21281/"}