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CVE-2019-15802

5.9 · MEDIUM

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

Published Nov 14, 2019CWE-798EPSS 1.50%

Overview

CVE-2019-15802 is a medium-severity vulnerability. It was published on November 14, 2019 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. 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. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in sal_util_str_encrypt() in libsal.so.0.0. The parameters (salt, IV, and key data) are used to encrypt and decrypt all passwords using AES256 in CBC mode. With the parameters known, all previously encrypted passwords can be decrypted. This includes the passwords that are part of configuration backups or otherwise embedded as part of the firmware.

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-2019-15802?

CVE-2019-15802 is a medium-severity vulnerability. It was published on November 14, 2019 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2019-15802?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-15802?

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-2019-15802?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-15802 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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