{"answers":{"affected":"It affects 8 products.","exploited":"There is no known exploitation of CVE-2021-20843 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20843 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20843 is a medium-severity cross-site scripting vulnerability in Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210, published on 24 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-20843 and fix it if it is affected.\n\nWhat it is: CVE-2021-20843 is a medium-severity cross-site scripting vulnerability in Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210, published on 24 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-20843 in the wild and no public exploit code.\n\nAffected product: Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210. 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-2021-20843/ (Markdown: https://insights.sbomify.com/CVE-2021-20843/index.md)","id":"CVE-2021-20843","markdown":"https://insights.sbomify.com/CVE-2021-20843/index.md","name":"CVE-2021-20843","record":{"aliases":["GHSA-pf3w-79fm-4mjf"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Yamaha network router","requires_auth":"low_privilege","summary":"Remote authenticated attackers can inject scripts into the Web GUI to alter device settings on Yamaha routers and NVRs.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"biz_box_nvr510_firmware","vendor":"ntt-west"},{"product":"biz_box_nvr700w_firmware","vendor":"ntt-west"},{"product":"biz_box_rtx1210_firmware","vendor":"ntt-west"},{"product":"biz_box_rtx830_firmware","vendor":"ntt-west"},{"product":"nvr510_firmware","vendor":"yamaha"},{"product":"nvr700w_firmware","vendor":"yamaha"},{"product":"rtx1210_firmware","vendor":"yamaha"},{"product":"rtx830_firmware","vendor":"yamaha"}],"cvss":{"score":5.4,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-829","name":"Inclusion of Functionality from Untrusted Control Sphere"}],"description":"Cross-site script inclusion vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR510 Rev.15.01.18 and earlier, NVR700W Rev.15.00.19 and earlier, and RTX1210 Rev.14.01.38 and earlier allows a remote authenticated attacker to alter the settings of the product via a specially crafted web page.","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":"Cross-site scripting in RTX830, NVR510, NVR700W, RTX1210","id":"CVE-2021-20843","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"Cross-site scripting in RTX830, NVR510, NVR700W, RTX1210","id":"CVE-2021-20844"},"packages":[],"prev":{"headline":"EC-CUBE Cross-site request forgery (CSRF) vulnerability","id":"CVE-2021-20842"},"products":["RTX830, NVR510, NVR700W, RTX1210"],"published":"2021-11-24","related":[{"cvss_score":5.7,"headline":"Cross-site scripting in RTX830, NVR510, NVR700W, RTX1210","id":"CVE-2021-20844","kev_date_added":null,"published":"2021-11-24"}],"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":["Yamaha Corporation"]},"summary":"Remote authenticated attackers can inject scripts into the Web GUI to alter device settings on Yamaha routers and NVRs.","url":"https://insights.sbomify.com/CVE-2021-20843/"}