{"id":"CVE-2019-15801","aliases":["EUVD-2019-6720","GHSA-g22q-gmqw-xvw4"],"status":"published","title":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware...","description":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01486,"percentile":0.7421,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-522","CWE-798"],"published":"2019-11-14T20:16:08Z","modified":"2026-06-17T02:21:06Z","products":[{"vendor":"zyxel","product":"gs1900-10hp_firmware"},{"vendor":"zyxel","product":"gs1900-16_firmware"},{"vendor":"zyxel","product":"gs1900-24_firmware"},{"vendor":"zyxel","product":"gs1900-24e_firmware"},{"vendor":"zyxel","product":"gs1900-24hp_firmware"},{"vendor":"zyxel","product":"gs1900-48_firmware"},{"vendor":"zyxel","product":"gs1900-48hp_firmware"},{"vendor":"zyxel","product":"gs1900-8_firmware"},{"vendor":"zyxel","product":"gs1900-8hp_firmware"}],"references":[{"url":"https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-15801"},{"url":"https://github.com/advisories/GHSA-g22q-gmqw-xvw4"}],"sources":{"cve":[{"id":"CVE-2019-15801","description":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.","status":"published","published":"2019-11-14T20:16:08Z","modified":"2024-08-05T00:56:22.466Z","updated_at":"2026-11-02T14:20:21.059499Z"}],"euvd":[{"id":"EUVD-2019-6720","description":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.","status":"published","published":"2019-11-14T20:16:08Z","modified":"2024-08-05T00:56:22Z","updated_at":"2026-11-03T02:40:34.569316Z"}],"ghsa":[{"id":"GHSA-g22q-gmqw-xvw4","title":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware...","description":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.","status":"published","published":"2022-05-24T17:01:17Z","modified":"2023-01-28T05:08:17Z","cwes":["CWE-522"],"updated_at":"2026-11-02T14:44:36.910779Z"}],"nvd":[{"id":"CVE-2019-15801","description":"An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.","status":"published","published":"2019-11-14T21:15:11.75Z","modified":"2026-06-17T02:21:06.14Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-798"],"updated_at":"2026-11-02T14:05:37.024431Z"}]}}