{"cve":"CVE-2020-29583","nvd":{"published":"2020-12-22T22:15:14.443","modified":"2026-06-17T03:11:28.957","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-522"],"references":["http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf","https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release","https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15","https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html","https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/"],"products":["zyxel:atp100_firmware","zyxel:atp100w_firmware","zyxel:atp200_firmware","zyxel:atp500_firmware","zyxel:atp700_firmware","zyxel:atp800_firmware","zyxel:usg1100_firmware","zyxel:usg110_firmware","zyxel:usg1900_firmware","zyxel:usg20-vpn_firmware","zyxel:usg20w-vpn_firmware","zyxel:usg210_firmware","zyxel:usg2200_firmware","zyxel:usg310_firmware","zyxel:usg40_firmware","zyxel:usg40w_firmware","zyxel:usg60_firmware","zyxel:usg60w_firmware","zyxel:usg_flex_100_firmware","zyxel:usg_flex_100w_firmware","zyxel:usg_flex_200_firmware","zyxel:usg_flex_500_firmware","zyxel:usg_flex_700_firmware","zyxel:vpn1000_firmware","zyxel:vpn100_firmware","zyxel:vpn300_firmware","zyxel:vpn50_firmware","zyxel:zywall1100_firmware","zyxel:zywall110_firmware","zyxel:zywall310_firmware"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-29583","score":0.90155,"percentile":0.99797,"date":"2026-10-31"},"kev":{"cve":"CVE-2020-29583","date_added":"2021-11-03","due_date":"2022-05-03","vendor":"Zyxel","product":"Multiple Products","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}