{"id":"CVE-2018-9129","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-9129","generatedAt":"2026-10-28T19:47:14.168Z","title":"ZyXEL ZyWALL/USG series devices have a Bleichenbacher vulnerability in their Internet Key Exchange (IKE) handshake implementation used for IPsec based VPN connections.","description":"ZyXEL ZyWALL/USG series devices have a Bleichenbacher vulnerability in their Internet Key Exchange (IKE) handshake implementation used for IPsec based VPN connections.","published":"2018-08-15T18:29:01.000Z","lastModified":"2026-06-17T02:06:07.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":[],"affected":["zyxel/zywall 110 firmware","zyxel/zywall 1100 firmware","zyxel/zywall 310 firmware","zyxel/zywall vpn 50 firmware","zyxel/zywall vpn 100 firmware","zyxel/zywall vpn 300 firmware","zyxel/usg 20w firmware","zyxel/usg 40 firmware","zyxel/usg 40w firmware","zyxel/usg 60 firmware","zyxel/usg 60w firmware","zyxel/usg 110 firmware","zyxel/usg 2200-vpn firmware","zyxel/usg 310 firmware","zyxel/usg 1100 firmware","zyxel/usg 1900 firmware","zyxel/usg 20w-vpn firmware"],"epss":{"score":0.00965,"percentile":0.61523,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.97%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"ftp://ftp.zyxel.com/USG110/firmware/USG110_4.32%28AAPH.0%29C0_2.pdf","source":"cve@mitre.org"},{"url":"https://web-in-security.blogspot.com/2018/08/practical-bleichenbacher-attacks-on-ipsec-ike.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.zyxel.com/support/bleichenbacher_attack_vulnerability.shtml","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"ftp://ftp.zyxel.com/USG110/firmware/USG110_4.32%28AAPH.0%29C0_2.pdf","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://web-in-security.blogspot.com/2018/08/practical-bleichenbacher-attacks-on-ipsec-ike.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zyxel.com/support/bleichenbacher_attack_vulnerability.shtml","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-9129","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."}