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CVE-2019-12789

6.8 · MEDIUM

An issue was discovered on Actiontec T2200H T2200H-31.128L.08 devices, as distributed by Telus.

Published Jun 17, 2019EPSS 0.57%

Overview

CVE-2019-12789 is a medium-severity vulnerability. It was published on June 17, 2019 and has a CVSS 3.0 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered on Actiontec T2200H T2200H-31.128L.08 devices, as distributed by Telus. By attaching a UART adapter to the UART pins on the system board, an attacker can use a special key sequence (Ctrl-\) to obtain a shell with root privileges. After gaining root access, the attacker can mount the filesystem read-write and make permanent modifications to the device including bricking of the device, disabling vendor management of the device, preventing automatic upgrades, and permanently installing malicious code on the device.

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

Refseclists.org/fulldisclosure/2019/Jun/10Refwww.actiontec.com/blog/Refseclists.org/fulldisclosure/2019/Jun/10Refwww.actiontec.com/blog/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-12789?

CVE-2019-12789 is a medium-severity vulnerability. It was published on June 17, 2019 and has a CVSS 3.0 base score of 6.8 (MEDIUM).

How severe is CVE-2019-12789?

This vulnerability has a CVSS 3.0 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-12789?

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-2019-12789?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-12789 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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