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CVE-2019-15799

8.8 · HIGH

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

Published Nov 14, 2019CWE-269EPSS 2.31%

Overview

CVE-2019-15799 is a high-severity vulnerability. It was published on November 14, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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.

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.htmlRefvimeo.com/354726424Refwww.zyxel.com/support/gs1900-switch-vulnerabilities.shtmlRefjasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlRefvimeo.com/354726424Refwww.zyxel.com/support/gs1900-switch-vulnerabilities.shtml

How CyberStrike helps

Frequently asked questions

What is CVE-2019-15799?

CVE-2019-15799 is a high-severity vulnerability. It was published on November 14, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2019-15799?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-15799?

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-2019-15799?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-15799 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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