{"id":"CVE-2021-20856","aliases":["EUVD-2021-8265","GHSA-r2j8-fmw2-73rf"],"status":"published","title":"Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior...","description":"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.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00605,"percentile":0.494,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-12-01T02:15:47Z","modified":"2026-06-17T03:34:32Z","products":[{"vendor":"elecom","product":"wrh-733gbk_firmware"},{"vendor":"elecom","product":"wrh-733gwh_firmware"},{"vendor":"elecom co.,ltd.","product":"elecom lan routers"}],"references":[{"url":"https://www.elecom.co.jp/news/security/20211130-01/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/en/jp/JVN88993473/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20856"},{"url":"https://github.com/advisories/GHSA-r2j8-fmw2-73rf"}],"sources":{"cve":[{"id":"CVE-2021-20856","description":"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.","status":"published","published":"2021-12-01T02:15:47Z","modified":"2024-08-03T17:53:22.658Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8265","description":"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.","status":"published","published":"2021-12-01T02:15:47Z","modified":"2024-08-03T17:53:22Z","updated_at":"2026-11-03T03:25:07.874589Z"}],"ghsa":[{"id":"GHSA-r2j8-fmw2-73rf","title":"Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior...","description":"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.","status":"published","published":"2021-12-02T00:00:59Z","modified":"2023-02-01T05:06:32Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:50:22.333418Z"}],"nvd":[{"id":"CVE-2021-20856","description":"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.","status":"published","published":"2021-12-01T03:15:06.897Z","modified":"2026-06-17T03:34:32.957Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:07:01.811115Z"}]}}