# CVE-2021-20122: Command injection in Telus Wi-Fi Hub (PRV65B444A-S-TS)

> Authenticated attackers can execute arbitrary commands as root on Telus Wi-Fi Hubs via command injection in tr69_cmd.cgi parameters.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Oct 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-28rc-568h-qq5j

## What is CVE-2021-20122?

CVE-2021-20122 is a high-severity command injection vulnerability in Telus Wi-Fi Hub (PRV65B444A-S-TS), published on 11 Oct 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is affected by an authenticated command injection vulnerability in multiple parameters passed to tr69_cmd.cgi. A remote attacker connected to the router's LAN and authenticated with a super user account, or using a bypass authentication vulnerability like CVE-2021-20090 could leverage this issue to run commands or gain a shell as root on the target device.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-20122?

It affects 1 product.


Products: Telus Prv65b444a-S-Ts Firmware.

## How do I fix CVE-2021-20122?

No fix has been published for CVE-2021-20122 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20122 being exploited?

There is no known exploitation of CVE-2021-20122 in the wild and no public exploit code.

## Other vulnerabilities in Telus Wi-Fi Hub (PRV65B444A-S-TS)

- [CVE-2021-20121](https://insights.sbomify.com/CVE-2021-20121/): Path traversal in Telus Wi-Fi Hub (PRV65B444A-S-TS) (medium 4.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20122 and fix it if it is affected.

What it is: CVE-2021-20122 is a high-severity command injection vulnerability in Telus Wi-Fi Hub (PRV65B444A-S-TS), published on 11 Oct 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-20122 in the wild and no public exploit code.

Affected product: Telus Wi-Fi Hub (PRV65B444A-S-TS). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-20122/ (Markdown: https://insights.sbomify.com/CVE-2021-20122/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20122
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20122
- OSV: https://osv.dev/vulnerability/CVE-2021-20122

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20122/
Summaries are generated and may contain mistakes; the official description above is the record.