CVE-2019-15799
8.8 · HIGHOverview
CVE-2019-15799 is a high-severity vulnerability affecting zyxel gs1900-8_firmware. 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 and patches from zyxel. Update gs1900-8_firmware to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zyxel | gs1900-8_firmware | >= 0, < 2.50\(aahh.0\)c0 | Affected |
| zyxel | gs1900-8hp_firmware | >= 0, < 2.50\(aahi.0\)c0 | Affected |
| zyxel | gs1900-10hp_firmware | >= 0, < 2.50\(aazi.0\)c0 | Affected |
| zyxel | gs1900-16_firmware | >= 0, < 2.50\(aahj.0\)c0 | Affected |
| zyxel | gs1900-24e_firmware | >= 0, < 2.50\(aahk.0\)c0 | Affected |
| zyxel | gs1900-24_firmware | >= 0, < 2.50\(aahl.0\)c0 | Affected |
| zyxel | gs1900-24hp_firmware | >= 0, < 2.50\(aahm.0\)c0 | Affected |
| zyxel | gs1900-48_firmware | >= 0, < 2.50\(aahn.0\)c0 | Affected |
| zyxel | gs1900-48hp_firmware | >= 0, < 2.50\(aaho.0\)c0 | Affected |
References
Frequently Asked Questions
What is CVE-2019-15799?
CVE-2019-15799 is a high-severity vulnerability affecting zyxel gs1900-8_firmware. 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 and patches from zyxel. Update gs1900-8_firmware to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2019-15799 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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