{"affected":[{"affectedData":[{"product":"ELECOM LAN routers","vendor":"ELECOM CO.,LTD.","versions":[{"status":"affected","version":"WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior"}]}],"source":"vultures@jpcert.or.jp"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:elecom:wrh-733gbk_firmware:*:*:*:*:*:*:*:*","matchCriteriaId":"28989732-6761-4356-A4CF-BE172E72C41B","versionEndIncluding":"1.02.9","vulnerable":true}],"negate":false,"operator":"OR"},{"cpeMatch":[{"criteria":"cpe:2.3:h:elecom:wrh-733gbk:-:*:*:*:*:*:*:*","matchCriteriaId":"84FA6C86-7C8A-4CF5-9065-CDECDFF65F7E","vulnerable":false}],"negate":false,"operator":"OR"}],"operator":"AND"},{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:elecom:wrh-733gwh_firmware:*:*:*:*:*:*:*:*","matchCriteriaId":"9AC22BBF-F3CF-4B47-B314-BA3DA9A4663D","versionEndIncluding":"1.02.9","vulnerable":true}],"negate":false,"operator":"OR"},{"cpeMatch":[{"criteria":"cpe:2.3:h:elecom:wrh-733gwh:-:*:*:*:*:*:*:*","matchCriteriaId":"08BFC900-6728-4EDB-8CC9-27101DF47FC9","vulnerable":false}],"negate":false,"operator":"OR"}],"operator":"AND"}],"cveTags":[],"descriptions":[{"lang":"en","value":"Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors."},{"lang":"es","value":"Una vulnerabilidad de tipo cross-site scripting en los routers LAN de ELECOM (firmware WRH-733GBK versiones v1.02.9 y anteriores y firmware WRH-733GWH versiones v1.02.9 y anteriores) permite a un atacante remoto autenticado inyectar un script arbitrario por vectores no especificados"}],"id":"CVE-2021-20856","lastModified":"2026-06-17T03:34:32.957","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"LOW","cvssData":{"accessComplexity":"MEDIUM","accessVector":"NETWORK","authentication":"SINGLE","availabilityImpact":"NONE","baseScore":3.5,"confidentialityImpact":"NONE","integrityImpact":"PARTIAL","vectorString":"AV:N/AC:M/Au:S/C:N/I:P/A:N","version":"2.0"},"exploitabilityScore":6.8,"impactScore":2.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":true}],"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"exploitabilityScore":2.3,"impactScore":2.7,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2021-12-01T03:15:06.897","references":[{"source":"vultures@jpcert.or.jp","tags":["Third Party Advisory"],"url":"https://jvn.jp/en/jp/JVN88993473/index.html"},{"source":"vultures@jpcert.or.jp","tags":["Vendor Advisory"],"url":"https://www.elecom.co.jp/news/security/20211130-01/"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://jvn.jp/en/jp/JVN88993473/index.html"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://www.elecom.co.jp/news/security/20211130-01/"}],"sourceIdentifier":"vultures@jpcert.or.jp","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-79"}],"source":"nvd@nist.gov","type":"Primary"}]}