{"id":"CVE-2021-35033","aliases":["EUVD-2021-21680","GHSA-pm46-rmc8-j8j3"],"status":"published","title":"A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30...","description":"A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00409,"percentile":0.35647,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-260","CWE-287","CWE-522"],"published":"2021-11-23T21:20:38Z","modified":"2026-06-17T03:57:00Z","products":[{"vendor":"zyxel","product":"nbg6818 series firmware"},{"vendor":"zyxel","product":"nbg6818_firmware"},{"vendor":"zyxel","product":"nbg7815 series firmware"},{"vendor":"zyxel","product":"nbg7815_firmware"},{"vendor":"zyxel","product":"wsq20 series firmware"},{"vendor":"zyxel","product":"wsq20_firmware"},{"vendor":"zyxel","product":"wsq50 series firmware"},{"vendor":"zyxel","product":"wsq50_firmware"},{"vendor":"zyxel","product":"wsq60 series firmware"},{"vendor":"zyxel","product":"wsq60_firmware"},{"vendor":"zyxel","product":"wsr30 series firmware"},{"vendor":"zyxel","product":"wsr30_firmware"}],"references":[{"url":"https://www.zyxel.com/support/Zyxel_security_advisory_for_pre-configured_password_management_vulnerability_of_home_routers_and_WiFi_systems.shtml","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.tenable.com/security/research/tra-2022-06","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35033"},{"url":"https://github.com/advisories/GHSA-pm46-rmc8-j8j3"}],"sources":{"cve":[{"id":"CVE-2021-35033","description":"A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.","status":"published","published":"2021-11-23T21:20:38Z","modified":"2024-08-04T00:33:49.871Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-260"],"updated_at":"2026-11-02T14:33:09.864034Z"}],"euvd":[{"id":"EUVD-2021-21680","description":"A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.","status":"published","published":"2021-11-23T21:20:38Z","modified":"2024-08-04T00:33:49Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T03:24:31.533826Z"}],"ghsa":[{"id":"GHSA-pm46-rmc8-j8j3","title":"A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30...","description":"A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.","status":"published","published":"2022-05-24T19:21:12Z","modified":"2023-01-30T05:02:53Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-287","CWE-522"],"updated_at":"2026-11-02T14:46:44.129156Z"}],"nvd":[{"id":"CVE-2021-35033","description":"A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.","status":"published","published":"2021-11-23T22:15:07.623Z","modified":"2026-06-17T03:57:00.923Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.9,"vector":"AV:L/AC:M/Au:N/C:C/I:C/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-260","CWE-287"],"updated_at":"2026-11-02T14:07:01.428028Z"}]}}