# CVE-2023-33013: Command injection in NBG6604 firmware

> Authenticated attackers can execute arbitrary OS commands on Zyxel NBG6604 routers via crafted HTTP requests in the NTP feature.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Aug 2023
- **Updated:** 9 Oct 2024
- **Also known as:** GHSA-xw24-fjv7-8w94

## What is CVE-2023-33013?

CVE-2023-33013 is a high-severity command injection vulnerability in Zyxel NBG6604 firmware, published on 14 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A post-authentication command injection vulnerability in the NTP feature of Zyxel NBG6604 firmware version V1.01(ABIR.1)C0 could allow an authenticated attacker to execute some OS commands remotely by sending a crafted HTTP request.

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

## Which versions are affected by CVE-2023-33013?

It affects 1 product.


Products: Zyxel Nbg6604 Firmware.

## How do I fix CVE-2023-33013?

No fix has been published for CVE-2023-33013 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-33013 being exploited?

There is no known exploitation of CVE-2023-33013 in the wild and no public exploit code.

## Other vulnerabilities in Zyxel NBG6604 firmware

- [CVE-2023-22919](https://insights.sbomify.com/CVE-2023-22919/): Command injection in NBG6604 firmware (high 8.8)
- [CVE-2021-35034](https://insights.sbomify.com/CVE-2021-35034/): Security feature bypass in NBG6604 series firmware (high 7.4)
- [CVE-2021-35035](https://insights.sbomify.com/CVE-2021-35035/): Information disclosure in NBG6604 series firmware (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-33013 and fix it if it is affected.

What it is: CVE-2023-33013 is a high-severity command injection vulnerability in Zyxel NBG6604 firmware, published on 14 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-33013 in the wild and no public exploit code.

Affected product: Zyxel NBG6604 firmware. 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-2023-33013/ (Markdown: https://insights.sbomify.com/CVE-2023-33013/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-33013
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-33013
- OSV: https://osv.dev/vulnerability/CVE-2023-33013

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-33013/
Summaries are generated and may contain mistakes; the official description above is the record.