{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-32771 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-32771 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-32771 is a high-severity memory corruption vulnerability in contiki-ng, published on 4 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-32771 and fix it if it is affected.\n\nWhat it is: CVE-2021-32771 is a high-severity memory corruption vulnerability in contiki-ng, published on 4 Aug 2022. 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-2021-32771 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-2021-32771/ (Markdown: https://insights.sbomify.com/CVE-2021-32771/index.md)","id":"CVE-2021-32771","markdown":"https://insights.sbomify.com/CVE-2021-32771/index.md","name":"CVE-2021-32771","record":{"aliases":[],"analysis":{"component_type":"operating_system","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"IoT operating system","requires_auth":"none","summary":"An attacker can trigger a buffer overflow in Contiki-NG's RPL implementation by sending a malformed DAO packet, 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":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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 IoT devices. In affected versions it is possible to cause a buffer overflow when copying an IPv6 address prefix in the RPL-Classic implementation in Contiki-NG. In order to trigger the vulnerability, the Contiki-NG system must have joined an RPL DODAG. After that, an attacker can send a DAO packet with a Target option that contains a prefix length larger than 128 bits. The problem was fixed after the release of Contiki-NG 4.7. Users unable to upgrade may apply the patch in Contiki-NG PR #1615.","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 in contiki-ng","id":"CVE-2021-32771","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in helper_entries","id":"CVE-2021-32772"},"packages":[],"prev":{"headline":"Basic-auth app bundle credential exposure in gatsby-source-wordpress","id":"CVE-2021-32770"},"products":["contiki-ng"],"published":"2022-08-04","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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-04-23","vendors":["contiki-ng"]},"summary":"An attacker can trigger a buffer overflow in Contiki-NG's RPL implementation by sending a malformed DAO packet, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2021-32771/"}