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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.
Use Zyxel vendor hub and Gs1900-8 Firmware product page to widen CVE-2019-15804 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2019-15803, CVE-2024-8881 and CVE-2021-35031 for nearby disclosures in the same product family.