CVE-2019-15804

7.5 HIGH 0.9% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering.
Exploit odds: 0.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2019-11-14 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 02:21 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.9% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2019-11-14 21:15 UTC
Last modified: 2026-06-17 02:21 UTC
Exploit probability: 0.9% · EPSS, next 30 days
Record status: Modified

Affected

Zyxel gs1900-8 Firmware < 2.50\(aahh.0\)c0
Zyxel gs1900-8hp Firmware < 2.50\(aahi.0\)c0
Zyxel gs1900-10hp Firmware < 2.50\(aazi.0\)c0
Zyxel gs1900-16 Firmware < 2.50\(aahj.0\)c0
Zyxel gs1900-24e Firmware < 2.50\(aahk.0\)c0
Zyxel gs1900-24 Firmware < 2.50\(aahl.0\)c0
Zyxel gs1900-24hp Firmware < 2.50\(aahm.0\)c0
Zyxel gs1900-48 Firmware < 2.50\(aahn.0\)c0

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record