{"cve_id":"CVE-2020-29583","published":"2020-12-22T22:15:14.443000+00:00","last_modified":"2026-06-17T03:11:28.957000+00:00","vuln_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_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-522"],"in_kev":true,"kev_date_added":"2021-11-03","kev_ransomware":false,"epss_score":0.90155,"epss_percentile":0.99796,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["CODE_EXEC","CRED_ACCESS","INFO_DISCLOSURE"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:29:21.966562+00:00","first_seen":"2020-12-22T22:15:14.443000+00:00","kev_first_seen":"2021-11-03T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["zyxel"],"products":["atp100","atp100_firmware","atp100w","atp100w_firmware","atp200","atp200_firmware","atp500","atp500_firmware","atp700","atp700_firmware","atp800","atp800_firmware","usg110","usg1100","usg1100_firmware","usg110_firmware","usg1900","usg1900_firmware","usg20-vpn","usg20-vpn_firmware","usg20w-vpn","usg20w-vpn_firmware","usg210","usg210_firmware","usg2200","usg2200_firmware","usg310","usg310_firmware","usg40","usg40_firmware","usg40w","usg40w_firmware","usg60","usg60_firmware","usg60w","usg60w_firmware","usg_flex_100","usg_flex_100_firmware","usg_flex_100w","usg_flex_100w_firmware","usg_flex_200","usg_flex_200_firmware","usg_flex_500","usg_flex_500_firmware","usg_flex_700","usg_flex_700_firmware","vpn100","vpn1000","vpn1000_firmware","vpn100_firmware","vpn300","vpn300_firmware","vpn50","vpn50_firmware","zywall110","zywall1100","zywall1100_firmware","zywall110_firmware","zywall310","zywall310_firmware"],"affected":[{"vendor":"zyxel","product":"atp100_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"atp100w_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"atp200_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"atp500_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"atp700_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"atp800_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg1100_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg110_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg1900_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg20-vpn_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg20w-vpn_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg210_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg2200_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg310_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg40_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg40w_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg60_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg60w_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg_flex_100_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg_flex_100w_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg_flex_200_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg_flex_500_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"usg_flex_700_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"vpn1000_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"vpn100_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"vpn300_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"vpn50_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"zywall1100_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"zywall110_firmware","ranges":["4.60"]},{"vendor":"zyxel","product":"zywall310_firmware","ranges":["4.60"]}]}