# CVE-2023-26921: Command injection in n/a

> Attackers can execute arbitrary commands on Quectel AG550QCN modules via the ql_atfwd interface, potentially compromising device integrity.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Apr 2023
- **Updated:** 13 Feb 2025
- **Also known as:** GHSA-fcmf-jqfc-733w

## What is CVE-2023-26921?

CVE-2023-26921 is a critical command injection vulnerability in n/a, published on 4 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OS Command Injection vulnerability in quectel AG550QCN allows attackers to execute arbitrary commands via ql_atfwd.

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

## Which versions are affected by CVE-2023-26921?

It affects 1 product.


Products: Quectel Ag550qcn Firmware.

## How do I fix CVE-2023-26921?

No fix has been published for CVE-2023-26921 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-26921 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-26921 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-26921 and fix it if it is affected.

What it is: CVE-2023-26921 is a critical command injection vulnerability in n/a, published on 4 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-26921 exists.

Affected product: n/a. 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-2023-26921/ (Markdown: https://insights.sbomify.com/CVE-2023-26921/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-26921
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-26921
- OSV: https://osv.dev/vulnerability/CVE-2023-26921

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-26921/
Summaries are generated and may contain mistakes; the official description above is the record.