# CVE-2023-28767: Command injection in ATP series firmware

> An unauthenticated LAN attacker can inject OS commands into Zyxel firewall configuration data when cloud management is enabled, leading to code execution.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Jul 2023
- **Updated:** 7 Nov 2024
- **Also known as:** GHSA-6hq2-q59r-h45h

## What is CVE-2023-28767?

CVE-2023-28767 is a high-severity command injection vulnerability in Zyxel ATP series firmware, published on 17 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The configuration parser fails to sanitize user-controlled input in the Zyxel ATP series firmware versions 5.10 through 5.36, USG FLEX series firmware versions 5.00 through 5.36,  USG FLEX 50(W) series firmware versions 5.10 through 5.36, 

USG20(W)-VPN series firmware versions 5.10 through 5.36, and VPN series firmware versions 5.00 through 5.36. An unauthenticated, LAN-based attacker could leverage the vulnerability to inject some operating system (OS) commands into the device configuration data on an affected device when the cloud management mode is enabled.

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

## Which versions are affected by CVE-2023-28767?

It affects 22 products.


Products: Zyxel Usg 20w-Vpn Firmware, Zyxel Usg 2200-Vpn Firmware, Zyxel Usg Flex 100 Firmware, Zyxel Usg Flex 100w Firmware, Zyxel Usg Flex 200 Firmware, Zyxel Usg Flex 500 Firmware, Zyxel Usg Flex 50 Firmware, Zyxel Usg Flex 50w Firmware, Zyxel Usg Flex 700 Firmware, Zyxel Zywall Atp100 Firmware, Zyxel Zywall Atp100w Firmware, Zyxel Zywall Atp200 Firmware, Zyxel Zywall Atp500 Firmware, Zyxel Zywall Atp700 Firmware, Zyxel Zywall Atp800 Firmware, Zyxel Zywall Vpn100 Firmware, Zyxel Zywall Vpn2s Firmware, Zyxel Zywall Vpn300 Firmware, Zyxel Zywall Vpn50 Firmware, Zyxel Zywall Vpn 100 Firmware and 2 more.

## How do I fix CVE-2023-28767?

No fix has been published for CVE-2023-28767 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-28767 being exploited?

There is no known exploitation of CVE-2023-28767 in the wild and no public exploit code.

## Other vulnerabilities in Zyxel ATP series firmware

- [CVE-2023-33011](https://insights.sbomify.com/CVE-2023-33011/): Command injection in ATP series firmware (high 8.8)
- [CVE-2023-33012](https://insights.sbomify.com/CVE-2023-33012/): Command injection in ATP series firmware (high 8.8)
- [CVE-2023-34138](https://insights.sbomify.com/CVE-2023-34138/): Command injection in ATP series firmware (high 8.0)
- [CVE-2023-22915](https://insights.sbomify.com/CVE-2023-22915/): Memory corruption in USG FLEX 50(W) firmware (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-28767 and fix it if it is affected.

What it is: CVE-2023-28767 is a high-severity command injection vulnerability in Zyxel ATP series firmware, published on 17 Jul 2023. 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-2023-28767 in the wild and no public exploit code.

Affected product: Zyxel ATP series 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-2023-28767/ (Markdown: https://insights.sbomify.com/CVE-2023-28767/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-28767
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-28767
- OSV: https://osv.dev/vulnerability/CVE-2023-28767

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-28767/
Summaries are generated and may contain mistakes; the official description above is the record.