# CVE-2022-3480: Denial-of-Service vulnerability in PHOENIX CONTACT mGuard product family

> Remote unauthenticated attackers can cause denial of service on PHOENIX CONTACT mGuard devices by flooding HTTPS connections, affecting industrial network security.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 15 Nov 2022
- **Updated:** 29 Apr 2025
- **Also known as:** GHSA-4pwc-87fv-q86q

## What is CVE-2022-3480?

CVE-2022-3480 is a high-severity denial of service vulnerability in PHOENIX CONTACT FL MGUARD CENTERPORT, published on 15 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A remote, unauthenticated attacker could cause a denial-of-service of PHOENIX CONTACT FL MGUARD and TC MGUARD devices below version 8.9.0 by sending a larger number of unauthenticated HTTPS connections originating from different source IP’s. Configuring firewall limits for incoming connections cannot prevent the issue.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2022-3480?

It affects 31 products.


Products: Phoenixcontact Fl Mguard Centerport 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, Phoenixcontact Fl Mguard Rs4000 Tx\/Tx-M Firmware, Phoenixcontact Fl Mguard Rs4000 Tx\/Tx-P Firmware, Phoenixcontact Fl Mguard Rs4000 Tx\/Tx Firmware, Phoenixcontact Fl Mguard Rs4000 Tx\/Tx Vpn Firmware, Phoenixcontact Fl Mguard Rs4004 Tx\/Dtx Firmware and 11 more.

## How do I fix CVE-2022-3480?

No fix has been published for CVE-2022-3480 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-3480 being exploited?

There is no known exploitation of CVE-2022-3480 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-3480 and fix it if it is affected.

What it is: CVE-2022-3480 is a high-severity denial of service vulnerability in PHOENIX CONTACT FL MGUARD CENTERPORT, published on 15 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-3480 in the wild and no public exploit code.

Affected product: PHOENIX CONTACT FL MGUARD CENTERPORT. 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-2022-3480/ (Markdown: https://insights.sbomify.com/CVE-2022-3480/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-3480
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-3480
- OSV: https://osv.dev/vulnerability/CVE-2022-3480

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-3480/
Summaries are generated and may contain mistakes; the official description above is the record.