{"cve_id":"CVE-2022-0342","published":"2022-03-28T13:15:07.747000+00:00","last_modified":"2026-06-17T04:20:25.573000+00:00","vuln_status":"Modified","description":"An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.32 through 5.20, VPN series firmware versions 4.30 through 5.20, and NSG series firmware versions V1.20 through V1.33 Patch 4, which could allow an attacker to bypass the web authentication and obtain administrative access of the device.","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-287"],"in_kev":false,"kev_date_added":null,"kev_ransomware":false,"epss_score":0.95134,"epss_percentile":0.99864,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["AUTH_BYPASS","CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:59:04.100714+00:00","first_seen":"2022-03-28T13:15:07.747000+00:00","kev_first_seen":null,"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","nsg300","nsg300_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","zywall_110","zywall_1100","zywall_1100_firmware","zywall_110_firmware","zywall_310","zywall_310_firmware"],"affected":[{"vendor":"zyxel","product":"atp100_firmware","ranges":["≥ 4.32 and ≤ 5.20"]},{"vendor":"zyxel","product":"atp100w_firmware","ranges":["≥ 4.32 and ≤ 5.20"]},{"vendor":"zyxel","product":"atp200_firmware","ranges":["≥ 4.32 and ≤ 5.20"]},{"vendor":"zyxel","product":"atp500_firmware","ranges":["≥ 4.32 and ≤ 5.20"]},{"vendor":"zyxel","product":"atp700_firmware","ranges":["≥ 4.32 and ≤ 5.20"]},{"vendor":"zyxel","product":"atp800_firmware","ranges":["≥ 4.32 and ≤ 5.20"]},{"vendor":"zyxel","product":"nsg300_firmware","ranges":["≥ 1.20 and < 1.33","1.33"]},{"vendor":"zyxel","product":"usg40_firmware","ranges":["≥ 4.20 and < 4.71"]},{"vendor":"zyxel","product":"usg40w_firmware","ranges":["≥ 4.20 and < 4.71"]},{"vendor":"zyxel","product":"usg60_firmware","ranges":["≥ 4.20 and < 4.71"]},{"vendor":"zyxel","product":"usg60w_firmware","ranges":["≥ 4.20 and < 4.71"]},{"vendor":"zyxel","product":"usg_flex_100_firmware","ranges":["≥ 4.50 and ≤ 5.20"]},{"vendor":"zyxel","product":"usg_flex_100w_firmware","ranges":["≥ 4.50 and ≤ 5.20"]},{"vendor":"zyxel","product":"usg_flex_200_firmware","ranges":["≥ 4.50 and ≤ 5.20"]},{"vendor":"zyxel","product":"usg_flex_500_firmware","ranges":["≥ 4.50 and ≤ 5.20"]},{"vendor":"zyxel","product":"usg_flex_700_firmware","ranges":["≥ 4.50 and ≤ 5.20"]},{"vendor":"zyxel","product":"vpn1000_firmware","ranges":["≥ 4.30 and < 5.21"]},{"vendor":"zyxel","product":"vpn100_firmware","ranges":["≥ 4.30 and < 5.21"]},{"vendor":"zyxel","product":"vpn300_firmware","ranges":["≥ 4.30 and < 5.21"]},{"vendor":"zyxel","product":"vpn50_firmware","ranges":["≥ 4.30 and < 5.21"]},{"vendor":"zyxel","product":"zywall_1100_firmware","ranges":["≥ 4.20 and < 4.71"]},{"vendor":"zyxel","product":"zywall_110_firmware","ranges":["≥ 4.20 and < 4.71"]},{"vendor":"zyxel","product":"zywall_310_firmware","ranges":["≥ 4.20 and < 4.71"]}]}