{"id":"CVE-2019-15804","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-15804","generatedAt":"2026-10-28T23:57:53.182Z","title":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0.","description":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be triggered by sending the SIGQUIT signal to the CLI application (e.g., through CTRL+\\ via SSH). The access control check for this menu does work and prohibits accessing the menu, which contains \"Password recovery for specific user\" options. The menu is believed to be accessible using a serial console.","published":"2019-11-14T21:15:12.000Z","lastModified":"2026-06-17T02:21:07.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":[],"affected":["zyxel/gs1900-8 firmware","zyxel/gs1900-8hp firmware","zyxel/gs1900-10hp firmware","zyxel/gs1900-16 firmware","zyxel/gs1900-24e firmware","zyxel/gs1900-24 firmware","zyxel/gs1900-24hp firmware","zyxel/gs1900-48 firmware","zyxel/gs1900-48hp firmware"],"epss":{"score":0.00931,"percentile":0.60446,"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":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.93%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-15804","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."}