{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-20853 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20853 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20853 is a medium-severity command injection vulnerability in ELECOM LAN routers, published on 1 Dec 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-2021-20853 and fix it if it is affected.\n\nWhat it is: CVE-2021-20853 is a medium-severity command injection vulnerability in ELECOM LAN routers, published on 1 Dec 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-2021-20853 in the wild and no public exploit code.\n\nAffected product: ELECOM LAN routers. 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-2021-20853/ (Markdown: https://insights.sbomify.com/CVE-2021-20853/index.md)","id":"CVE-2021-20853","markdown":"https://insights.sbomify.com/CVE-2021-20853/index.md","name":"CVE-2021-20853","record":{"aliases":["GHSA-mjp9-fwhq-c9rm"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"ELECOM LAN router","requires_auth":"high_privilege","summary":"An administrator on ELECOM LAN routers can execute arbitrary OS commands, posing a risk of full device compromise.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"wrh-733gbk_firmware","vendor":"elecom"},{"product":"wrh-733gwh_firmware","vendor":"elecom"}],"cvss":{"score":6.8,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"description":"ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a network-adjacent attacker with an administrator privilege to execute arbitrary OS commands via unspecified vectors.","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":"Command injection in ELECOM LAN routers","id":"CVE-2021-20853","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"command_injection","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20854"},"packages":[],"prev":{"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20852"},"products":["ELECOM LAN routers"],"published":"2021-12-01","related":[{"cvss_score":6.8,"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20852","kev_date_added":null,"published":"2021-12-01"},{"cvss_score":6.8,"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20854","kev_date_added":null,"published":"2021-12-01"},{"cvss_score":5.4,"headline":"Cross-site scripting in ELECOM LAN routers","id":"CVE-2021-20855","kev_date_added":null,"published":"2021-12-01"},{"cvss_score":5.4,"headline":"Cross-site scripting in ELECOM LAN routers","id":"CVE-2021-20856","kev_date_added":null,"published":"2021-12-01"}],"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":["ELECOM CO.,LTD."]},"summary":"An administrator on ELECOM LAN routers can execute arbitrary OS commands, posing a risk of full device compromise.","url":"https://insights.sbomify.com/CVE-2021-20853/"}