# CVE-2021-4470: TG8 Firewall Unauthenticated RCE via runphpcmd.php

> Unauthenticated attackers can execute arbitrary OS commands as root via the runphpcmd.php endpoint, leading to full device compromise.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Nov 2025
- **Updated:** 18 Nov 2025
- **Also known as:** GHSA-vqv4-pwx4-w694

## What is CVE-2021-4470?

CVE-2021-4470 is a critical command injection vulnerability in TG8 Firewall, published on 14 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

TG8 Firewall contains a pre-authentication remote code execution vulnerability in the runphpcmd.php endpoint. The syscmd POST parameter is passed directly to a system command without validation and executed with root privileges. A remote, unauthenticated attacker can supply crafted values to execute arbitrary operating system commands as root, resulting in full device compromise.

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

## Which versions are affected by CVE-2021-4470?


## How do I fix CVE-2021-4470?

No fix has been published for CVE-2021-4470 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-4470 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-4470 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4470 and fix it if it is affected.

What it is: CVE-2021-4470 is a critical command injection vulnerability in TG8 Firewall, published on 14 Nov 2025. 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-2021-4470 exists.

Affected product: TG8 Firewall. 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-2021-4470/ (Markdown: https://insights.sbomify.com/CVE-2021-4470/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4470
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4470
- OSV: https://osv.dev/vulnerability/CVE-2021-4470

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-4470/
Summaries are generated and may contain mistakes; the official description above is the record.