{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-3418 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-3418 is a medium-severity vulnerability in grub2, published on 15 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-2021-3418 and fix it if it is affected.\n\nWhat it is: CVE-2021-3418 is a medium-severity vulnerability in grub2, published on 15 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-2021-3418 in the wild and no public exploit code.\n\nAffected product: grub2. 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-2021-3418/ (Markdown: https://insights.sbomify.com/CVE-2021-3418/index.md)","id":"CVE-2021-3418","markdown":"https://insights.sbomify.com/CVE-2021-3418/index.md","name":"CVE-2021-3418","record":{"aliases":["ALPINE-CVE-2021-3418","AZL-6467","GHSA-j6wm-c7q8-jcx7"],"analysis":{"component_type":"operating_system","fix_type":"upgrade","impacts":["privilege_escalation","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"GRUB bootloader","requires_auth":"high_privilege","summary":"Attackers can bypass Secure Boot signature validation to boot tampered kernels, enabling privilege escalation and code execution on affected systems.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"grub2","vendor":"gnu"}],"cvss":{"score":6.4,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-281","name":"Improper Preservation of Permissions"}],"description":"If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.","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":"Security feature bypass in grub2","id":"CVE-2021-3418","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"DO NOT USE THIS CANDIDATE NUMBER.","id":"CVE-2021-3419"},"packages":[],"prev":{"headline":"Information disclosure in XClarity Orchestrator","id":"CVE-2021-3417"},"products":["grub2"],"published":"2021-03-15","related":[{"cvss_score":8.8,"headline":"Memory corruption in GRUB2","id":"CVE-2024-56737","kev_date_added":null,"published":"2024-12-29"},{"cvss_score":8.1,"headline":"Integer underflow in grub_net_recv_ip4_packets","id":"CVE-2022-28733","kev_date_added":null,"published":"2023-07-20"},{"cvss_score":8.1,"headline":"Out-of-bounds write when handling split HTTP headers","id":"CVE-2022-28734","kev_date_added":null,"published":"2023-07-20"},{"cvss_score":7.8,"headline":"Grub2: missing unregister call for gettext command may lead to use-after-free","id":"CVE-2025-61662","kev_date_added":null,"published":"2025-11-18"},{"cvss_score":7.8,"headline":"Grub2: fs/hfs: strcpy() using the volume name (fs/hfs.c:382)","id":"CVE-2024-45782","kev_date_added":null,"published":"2025-03-03"},{"cvss_score":7.8,"headline":"Grub2: squash4: integer overflow may lead to heap based out-of-bounds write when reading data","id":"CVE-2025-0678","kev_date_added":null,"published":"2025-03-03"},{"cvss_score":7.8,"headline":"Grub2: udf: heap based buffer overflow in grub_udf_read_block() may lead to arbitrary code execution","id":"CVE-2025-0689","kev_date_added":null,"published":"2025-03-03"}],"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":["n/a"]},"summary":"Attackers can bypass Secure Boot signature validation to boot tampered kernels, enabling privilege escalation and code execution on affected systems.","url":"https://insights.sbomify.com/CVE-2021-3418/"}