CVE-2019-15803: Improper Authentication

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fdssyspassDebugPasswdret. The...

CVE-2019-15804: Undefined Security Weakness

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. 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...

CVE-2019-15800: Improper Neutralization of Special Elements used in an OS Command

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Due to lack of input validation in the cmdsystracerouteexec, cmdsysarpclear, and cmdsyspingexec functions in the libclicmd.so library contained in the firmware, an attacker could leverage these functions to call...

CVE-2019-15799: Improper Privilege Management

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH while their...

PT-2019-4115

Name of the Vulnerable Software and Affected Versions Zyxel GS1900 devices with firmware before 2.50AAHH.0C0 Description An issue exists due to a lack of input validation in the cmd sys traceroute exec, cmd sys arp clear, and cmd sys ping exec functions in the libclicmd.so library. This could all...

CVE-2015-7256

ZyXEL NWA1100-N, NWA1100-NH, NWA1121-NI, NWA1123-AC, and NWA1123-NI access points; P-660HN-51, P-663HN-51, VMG1312-B10A, VMG1312-B30A, VMG1312-B30B, VMG4380-B10A, VMG8324-B10A, VMG8924-B10A, VMG8924-B30A, and VSG1435-B101 DSL CPEs; PMG5318-B20A GPONs; SBG3300-N000, SBG3300-NB00, and SBG3500-N000...