CVE-2019-15801

HIGH

Zyxel GS1900 Series Firmware < 2.50 - Use of Hard-coded Credentials in libfds.so

Title source: llm
STIX 2.1

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.

References (2)

Core 2
Core References
Exploit, Third Party Advisory x_refsource_misc
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html

Scores

CVSS v3 7.5
EPSS 0.0029
EPSS Percentile 52.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-798
Status published
Products (9)
zyxel/gs1900-10hp_firmware < 2.50\(aazi.0\)c0
zyxel/gs1900-16_firmware < 2.50\(aahj.0\)c0
zyxel/gs1900-24_firmware < 2.50\(aahl.0\)c0
zyxel/gs1900-24e_firmware < 2.50\(aahk.0\)c0
zyxel/gs1900-24hp_firmware < 2.50\(aahm.0\)c0
zyxel/gs1900-48_firmware < 2.50\(aahn.0\)c0
zyxel/gs1900-48hp_firmware < 2.50\(aaho.0\)c0
zyxel/gs1900-8_firmware < 2.50\(aahh.0\)c0
zyxel/gs1900-8hp_firmware < 2.50\(aahi.0\)c0
Published Nov 14, 2019
Tracked Since Feb 18, 2026