{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-4020 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-4020 is a high-severity cross-site scripting vulnerability in meetecho/janus-gateway, published on 27 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-4020 and fix it if it is affected.\n\nWhat it is: CVE-2021-4020 is a high-severity cross-site scripting vulnerability in meetecho/janus-gateway, published on 27 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-4020 in the wild and no public exploit code.\n\nAffected product: meetecho/janus-gateway. 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-2021-4020/ (Markdown: https://insights.sbomify.com/CVE-2021-4020/index.md)","id":"CVE-2021-4020","markdown":"https://insights.sbomify.com/CVE-2021-4020/index.md","name":"CVE-2021-4020","record":{"aliases":["DEBIAN-CVE-2021-4020","GHSA-cq47-8w25-m65v","UBUNTU-CVE-2021-4020","openSUSE-SU-2024:11675-1"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["code_execution","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Janus WebRTC Gateway","requires_auth":"low_privilege","summary":"Stored XSS in Janus Gateway allows attackers to inject malicious scripts, potentially leading to session hijacking or data theft.","user_interaction":"not_required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"@huntrdev","cpe":[{"product":"janus","vendor":"meetecho"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","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":"Cross-site Scripting (XSS) - Stored in meetecho/janus-gateway","id":"CVE-2021-4020","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Denial of service in radare2","id":"CVE-2021-4021"},"packages":[],"prev":{"headline":"Heap-based Buffer Overflow in vim/vim","id":"CVE-2021-4019"},"products":["meetecho/janus-gateway"],"published":"2021-11-27","related":[{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-14033","kev_date_added":null,"published":"2020-06-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-14034","kev_date_added":null,"published":"2020-06-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-13901","kev_date_added":null,"published":"2020-06-10"},{"cvss_score":9.8,"headline":"Null dereference in n/a","id":"CVE-2020-10574","kev_date_added":null,"published":"2020-03-14"},{"cvss_score":8.1,"headline":"Cross-site Scripting (XSS) - Stored in meetecho/janus-gateway","id":"CVE-2021-4124","kev_date_added":null,"published":"2021-12-16"},{"cvss_score":7.5,"headline":"Null dereference in n/a","id":"CVE-2020-13898","kev_date_added":null,"published":"2020-06-10"}],"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":["meetecho"]},"summary":"Stored XSS in Janus Gateway allows attackers to inject malicious scripts, potentially leading to session hijacking or data theft.","url":"https://insights.sbomify.com/CVE-2021-4020/"}