CVE-2019-15799

What it is

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. 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 permissions via the web interface are in fact restricted). This allows normal users to obtain the administrative password by running the tech-support command via the CLI: this contains the encrypted passwords for all users on the device. As these passwords are encrypted using well-known and static parameters, they can be decrypted and the original passwords (including the administrator password) can be obtained.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

2.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-11-14 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 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: 2.3% in the next 30 days (EPSS).
• Severity: 8.8 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

2.3% · EPSS, next 30 days

Weakness

CWE-269 · Improper privilege management

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 · 8.8

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-15799.md and follow it. Check whether this project is affected by CVE-2019-15799. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge