{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-4127 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-4127 is a critical vulnerability in Mozilla Firefox Esr, published on 22 Dec 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-2021-4127 and fix it if it is affected.\n\nWhat it is: CVE-2021-4127 is a critical vulnerability in Mozilla Firefox Esr, published on 22 Dec 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-2021-4127 in the wild and no public exploit code.\n\nAffected product: Mozilla Firefox Esr. 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-2021-4127/ (Markdown: https://insights.sbomify.com/CVE-2021-4127/index.md)","id":"CVE-2021-4127","markdown":"https://insights.sbomify.com/CVE-2021-4127/index.md","name":"CVE-2021-4127","record":{"aliases":["DEBIAN-CVE-2021-4127","GHSA-7wp9-fj5q-c4jc"],"analysis":{"component_type":"browser","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Mozilla browser/email client","requires_auth":"none","summary":"Outdated graphics library in Thunderbird and Firefox ESR may allow attackers to execute arbitrary code via potential vulnerabilities.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mozilla","cpe":[{"product":"firefox_esr","vendor":"mozilla"},{"product":"thunderbird","vendor":"mozilla"}],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited. This vulnerability affects Thunderbird \u003c 78.9 and Firefox ESR \u003c 78.9.","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":"Other in Firefox ESR","id":"CVE-2021-4127","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"mozilla:firefox_esr","products":["mozilla:firefox_esr","mozilla:thunderbird"],"type":"other","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Use after free in Firefox","id":"CVE-2021-4128"},"packages":[],"prev":{"headline":"Security feature bypass in Thunderbird","id":"CVE-2021-4126"},"products":["Firefox ESR","Thunderbird"],"published":"2022-12-22","related":[{"cvss_score":8.8,"headline":"Memory corruption in Firefox ESR","id":"CVE-2023-25746","kev_date_added":null,"published":"2023-06-02"},{"cvss_score":8.8,"headline":"Memory corruption in Firefox ESR","id":"CVE-2021-38495","kev_date_added":null,"published":"2021-11-03"},{"cvss_score":8.8,"headline":"Use after free in Firefox ESR","id":"CVE-2020-15669","kev_date_added":null,"published":"2020-10-01"},{"cvss_score":7.5,"headline":"Use after free in Firefox ESR","id":"CVE-2022-38476","kev_date_added":null,"published":"2022-12-22"},{"cvss_score":7.5,"headline":"Path traversal in Firefox ESR","id":"CVE-2020-6828","kev_date_added":null,"published":"2020-04-24"},{"cvss_score":6.5,"headline":"Memory corruption in Firefox ESR","id":"CVE-2023-1945","kev_date_added":null,"published":"2023-06-02"}],"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-04-16","vendors":["Mozilla"]},"summary":"Outdated graphics library in Thunderbird and Firefox ESR may allow attackers to execute arbitrary code via potential vulnerabilities.","url":"https://insights.sbomify.com/CVE-2021-4127/"}