# CVE-2024-43390: Phoenix Contact: Firewall reconfiguration due to improper input validation in MGUARD devices

> A low-privileged remote attacker can inject code via environment variables to reconfigure firewall services, causing denial of service.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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:** 10 Sep 2024
- **Updated:** 22 Aug 2025
- **Also known as:** GHSA-vw69-gxfr-pfgr

## What is CVE-2024-43390?

CVE-2024-43390 is a high-severity code injection vulnerability in PHOENIX CONTACT FL MGUARD 2102, published on 10 Sep 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A low privileged remote attacker can perform configuration changes of the firewall services, including packet forwarding or NAT through the FW_NAT.IN_IP environment variable which can lead to a DoS.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2024-43390?

It affects 36 products.


Products: Phoenixcontact Fl Mguard 2102 Firmware, Phoenixcontact Fl Mguard 2105 Firmware, Phoenixcontact Fl Mguard 4102 Pci Firmware, Phoenixcontact Fl Mguard 4102 Pcie Firmware, Phoenixcontact Fl Mguard 4302 Firmware, Phoenixcontact Fl Mguard 4305 Firmware, Phoenixcontact Fl Mguard Centerport Vpn-1000 Firmware, Phoenixcontact Fl Mguard Core Tx Firmware, Phoenixcontact Fl Mguard Core Tx Vpn Firmware, Phoenixcontact Fl Mguard Delta Tx\/Tx Firmware, Phoenixcontact Fl Mguard Delta Tx\/Tx Vpn Firmware, Phoenixcontact Fl Mguard Gt\/Gt Firmware, Phoenixcontact Fl Mguard Gt\/Gt Vpn Firmware, Phoenixcontact Fl Mguard Pci4000 Firmware, Phoenixcontact Fl Mguard Pci4000 Vpn Firmware, Phoenixcontact Fl Mguard Pcie4000 Firmware, Phoenixcontact Fl Mguard Pcie4000 Vpn Firmware, Phoenixcontact Fl Mguard Rs2000 Tx\/Tx-B Firmware, Phoenixcontact Fl Mguard Rs2000 Tx\/Tx Vpn Firmware, Phoenixcontact Fl Mguard Rs2005 Tx Vpn Firmware and 16 more.

## How do I fix CVE-2024-43390?

No fix has been published for CVE-2024-43390 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-43390 being exploited?

There is no known exploitation of CVE-2024-43390 in the wild and no public exploit code.

## Other vulnerabilities in PHOENIX CONTACT FL MGUARD 2102

- [CVE-2024-43385](https://insights.sbomify.com/CVE-2024-43385/): Phoenix Contact: OS command execution through PROXY_HTTP_PORT in mGuard devices (high 8.8)
- [CVE-2024-43386](https://insights.sbomify.com/CVE-2024-43386/): Phoenix Contact: OS command execution through EMAIL_NOTIFICATION.TO in mGuard devices. (high 8.8)
- [CVE-2024-43387](https://insights.sbomify.com/CVE-2024-43387/): Phoenix Contact: Access files due to improper neutralization of special elements in MGUARD devices (high 8.8)
- [CVE-2024-43388](https://insights.sbomify.com/CVE-2024-43388/): Phoenix Contact: SNMP reconfiguration due to improper input validation in MGUARD devices (high 8.8)
- [CVE-2024-7699](https://insights.sbomify.com/CVE-2024-7699/): Phoenix Contact: OS command execution in MGUARD products (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-43390 and fix it if it is affected.

What it is: CVE-2024-43390 is a high-severity code injection vulnerability in PHOENIX CONTACT FL MGUARD 2102, published on 10 Sep 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-43390 in the wild and no public exploit code.

Affected product: PHOENIX CONTACT FL MGUARD 2102. 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-2024-43390/ (Markdown: https://insights.sbomify.com/CVE-2024-43390/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-43390
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-43390
- OSV: https://osv.dev/vulnerability/CVE-2024-43390

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-43390/
Summaries are generated and may contain mistakes; the official description above is the record.