# CVE-2021-21905: Memory corruption in Garrett Metal Detectors

> An authenticated attacker can trigger a stack-based buffer overflow in the CMA readfile function to execute arbitrary code on the device.

- **Severity:** High 8.2 (`CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-h558-j9v9-7j5j

## What is CVE-2021-21905?

CVE-2021-21905 is a high-severity memory corruption vulnerability in Garrett Metal Detectors, published on 22 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Stack-based buffer overflow vulnerability exists in how the CMA readfile function of Garrett Metal Detectors iC Module CMA Version 5.0 is used at various locations. The Garrett iC Module exposes an authenticated CLI over TCP port 6877. This interface is used by a secondary GUI client, called “CMA Connect”, to interact with the iC Module on behalf of the user. After a client successfully authenticates, they can send plaintext commands to manipulate the device.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2021-21905?

It affects 1 product.


Products: Garrett Ic Module Cma.

## How do I fix CVE-2021-21905?

No fix has been published for CVE-2021-21905 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21905 being exploited?

There is no known exploitation of CVE-2021-21905 in the wild and no public exploit code.

## Other vulnerabilities in Garrett Metal Detectors

- [CVE-2021-21901](https://insights.sbomify.com/CVE-2021-21901/): Memory corruption in Garrett Metal Detectors (critical 9.8)
- [CVE-2021-21903](https://insights.sbomify.com/CVE-2021-21903/): Memory corruption in Garrett Metal Detectors (critical 9.8)
- [CVE-2021-21904](https://insights.sbomify.com/CVE-2021-21904/): Path traversal in Garrett Metal Detectors (critical 9.1)
- [CVE-2021-21906](https://insights.sbomify.com/CVE-2021-21906/): Memory corruption in Garrett Metal Detectors (high 8.2)
- [CVE-2021-21902](https://insights.sbomify.com/CVE-2021-21902/): Auth bypass in Garrett Metal Detectors (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21905 and fix it if it is affected.

What it is: CVE-2021-21905 is a high-severity memory corruption vulnerability in Garrett Metal Detectors, published on 22 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-21905 in the wild and no public exploit code.

Affected product: Garrett Metal Detectors. 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-2021-21905/ (Markdown: https://insights.sbomify.com/CVE-2021-21905/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21905
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21905
- OSV: https://osv.dev/vulnerability/CVE-2021-21905

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21905/
Summaries are generated and may contain mistakes; the official description above is the record.