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CVE-2019-15804

7.5 · HIGH

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

Published Nov 14, 2019EPSS 0.93%

Overview

CVE-2019-15804 is a high-severity vulnerability. It was published on November 14, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refjasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlRefwww.zyxel.com/support/gs1900-switch-vulnerabilities.shtmlRefjasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlRefwww.zyxel.com/support/gs1900-switch-vulnerabilities.shtml

How CyberStrike helps

Frequently asked questions

What is CVE-2019-15804?

CVE-2019-15804 is a high-severity vulnerability. It was published on November 14, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-15804?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-15804?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-15804?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-15804 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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