High severity7.5NVD Advisory· Published Nov 14, 2019· Updated Jun 17, 2026
CVE-2019-15801
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
10- cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*Range: <2.50\(aazi.0\)c0
- cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*Range: <2.50\(aahk.0\)c0
- cpe:2.3:o:zyxel:gs1900-24hp_firmware:*:*:*:*:*:*:*:*Range: <2.50\(aahm.0\)c0
- cpe:2.3:o:zyxel:gs1900-48hp_firmware:*:*:*:*:*:*:*:*Range: <2.50\(aaho.0\)c0
- cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*Range: <2.50\(aahi.0\)c0
Patches
Vulnerability mechanics
References
2- jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlnvdExploitThird Party Advisory
- www.zyxel.com/support/gs1900-switch-vulnerabilities.shtmlnvdVendor Advisory
News mentions
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