{"id":"CVE-2020-29583","aliases":["EUVD-2020-21944","GHSA-59jx-m3c4-2m9w"],"status":"published","title":"Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an...","description":"Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.90155,"percentile":0.99799,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-312","CWE-522"],"published":"2020-12-22T00:00:00Z","modified":"2026-06-17T03:11:28Z","kev":{"date_added":"2021-11-03","due_date":"2022-05-03","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2021-11-03"},{"source":"kev","since":"2021-11-03"}],"exploits":[{"source":"pocgithub","id":"ruppde/scan_CVE-2020-29583","title":"ruppde/scan_CVE-2020-29583","date":"2021-01-04","url":"https://github.com/ruppde/scan_CVE-2020-29583"},{"source":"nuclei","id":"CVE-2020-29583","title":"ZyXel USG - Hardcoded Credentials","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-29583.yaml"}],"products":[{"vendor":"zyxel","product":"atp100_firmware"},{"vendor":"zyxel","product":"atp100w_firmware"},{"vendor":"zyxel","product":"atp200_firmware"},{"vendor":"zyxel","product":"atp500_firmware"},{"vendor":"zyxel","product":"atp700_firmware"},{"vendor":"zyxel","product":"atp800_firmware"},{"vendor":"zyxel","product":"multiple products"},{"vendor":"zyxel","product":"usg1100_firmware"},{"vendor":"zyxel","product":"usg110_firmware"},{"vendor":"zyxel","product":"usg1900_firmware"},{"vendor":"zyxel","product":"usg20-vpn_firmware"},{"vendor":"zyxel","product":"usg20w-vpn_firmware"},{"vendor":"zyxel","product":"usg210_firmware"},{"vendor":"zyxel","product":"usg2200_firmware"},{"vendor":"zyxel","product":"usg310_firmware"},{"vendor":"zyxel","product":"usg40_firmware"},{"vendor":"zyxel","product":"usg40w_firmware"},{"vendor":"zyxel","product":"usg60_firmware"},{"vendor":"zyxel","product":"usg60w_firmware"},{"vendor":"zyxel","product":"usg_flex_100_firmware"},{"vendor":"zyxel","product":"usg_flex_100w_firmware"},{"vendor":"zyxel","product":"usg_flex_200_firmware"},{"vendor":"zyxel","product":"usg_flex_500_firmware"},{"vendor":"zyxel","product":"usg_flex_700_firmware"},{"vendor":"zyxel","product":"vpn1000_firmware"},{"vendor":"zyxel","product":"vpn100_firmware"},{"vendor":"zyxel","product":"vpn300_firmware"},{"vendor":"zyxel","product":"vpn50_firmware"},{"vendor":"zyxel","product":"zywall1100_firmware"},{"vendor":"zyxel","product":"zywall110_firmware"},{"vendor":"zyxel","product":"zywall310_firmware"}],"references":[{"url":"https://www.zyxel.com/support/security_advisories.shtml","tags":["x_transferred","Vendor Advisory"]},{"url":"http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf","tags":["x_transferred","Broken Link"]},{"url":"https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15","tags":["x_transferred","Release Notes"]},{"url":"https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release","tags":["x_transferred","Release Notes"]},{"url":"https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html","tags":["x_transferred","Broken Link","Third Party Advisory"]},{"url":"https://www.zyxel.com/support/CVE-2020-29583.shtml","tags":["x_transferred","Vendor Advisory"]},{"url":"https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/","tags":["x_transferred","Exploit","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-29583","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-29583"},{"url":"http://ftp.zyxel.com/USG40/firmware/USG40_4.60(AALA.1)C0_2.pdf"},{"url":"https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583"},{"url":"https://github.com/advisories/GHSA-59jx-m3c4-2m9w"}],"sources":{"cve":[{"id":"CVE-2020-29583","description":"Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.","status":"published","published":"2020-12-22T00:00:00Z","modified":"2025-10-21T23:35:31.245Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-522"],"updated_at":"2026-11-02T14:35:55.460269Z"}],"euvd":[{"id":"EUVD-2020-21944","description":"Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.","status":"published","published":"2020-12-22T00:00:00Z","modified":"2025-10-21T23:35:31Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T20:31:25.308373Z"}],"ghsa":[{"id":"GHSA-59jx-m3c4-2m9w","title":"Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an...","description":"Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.","status":"published","published":"2022-05-24T17:37:06Z","modified":"2025-10-22T00:33:07Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-312","CWE-522"],"updated_at":"2026-11-02T15:04:07.67458Z"}],"kev":[{"id":"CVE-2020-29583","title":"Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability","description":"Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account (\"zyfwp\") with an unchangeable password.","cwes":["CWE-522"],"kev":{"date_added":"2021-11-03","due_date":"2022-05-03","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:17.050017Z"}],"nvd":[{"id":"CVE-2020-29583","description":"Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.","status":"published","published":"2020-12-22T22:15:14.443Z","modified":"2026-06-17T03:11:28.957Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-522"],"updated_at":"2026-11-02T14:06:27.73474Z"}]}}