{"id":"CVE-2022-0342","url":"https://www.cyber-defence.io/tools/cve/CVE-2022-0342","generatedAt":"2026-11-05T00:29:51.849Z","title":"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…","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.","published":"2022-03-28T13:15:08.000Z","lastModified":"2026-06-17T04:20:26.000Z","status":"Modified","sourceIdentifier":"security@zyxel.com.tw","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-287"],"affected":["zyxel/usg40 firmware","zyxel/usg40w firmware","zyxel/usg60 firmware","zyxel/usg60w firmware","zyxel/zywall 110 firmware","zyxel/zywall 310 firmware","zyxel/zywall 1100 firmware","zyxel/usg flex 100 firmware","zyxel/usg flex 200 firmware","zyxel/usg flex 500 firmware","zyxel/usg flex 100w firmware","zyxel/usg flex 700 firmware","zyxel/atp100 firmware","zyxel/atp100w firmware","zyxel/atp200 firmware","zyxel/atp500 firmware","zyxel/atp700 firmware","zyxel/atp800 firmware","zyxel/vpn50 firmware","zyxel/vpn100 firmware","zyxel/vpn300 firmware","zyxel/vpn1000 firmware","zyxel/nsg300 firmware"],"epss":{"score":0.95134,"percentile":0.99864,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 95.1%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-vulnerability-of-firewalls.shtml","tags":["Vendor Advisory"],"source":"security@zyxel.com.tw"},{"url":"https://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-vulnerability-of-firewalls.shtml","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-0342","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}