# CVE-2019-5080: Denial of service in WAGO PFC100

> An unauthenticated attacker can send a single packet to cause a denial of service and reset credentials to defaults on WAGO PFC controllers.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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:** 18 Dec 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-753h-jhp3-85mr

## What is CVE-2019-5080?

CVE-2019-5080 is a critical denial of service vulnerability in WAGO PFC100, published on 18 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An exploitable denial-of-service vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC 200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A single packet can cause a denial of service and weaken credentials resulting in the default documented credentials being applied to the device. An attacker can send an unauthenticated packet to trigger this vulnerability.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2019-5080?

It affects 2 products.


Products: Wago Pfc 100 Firmware, Wago Pfc 200 Firmware.

## How do I fix CVE-2019-5080?

No fix has been published for CVE-2019-5080 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-5080 being exploited?

There is no known exploitation of CVE-2019-5080 in the wild and no public exploit code.

## Other vulnerabilities in WAGO PFC100

- [CVE-2020-12522](https://insights.sbomify.com/CVE-2020-12522/): Command injection in Series PFC 100 (750-81xx/xxx-xxx) (critical 10.0)
- [CVE-2019-5074](https://insights.sbomify.com/CVE-2019-5074/): Memory corruption in WAGO PFC100 (critical 9.8)
- [CVE-2019-5075](https://insights.sbomify.com/CVE-2019-5075/): Memory corruption in WAGO PFC100 (critical 9.8)
- [CVE-2019-5079](https://insights.sbomify.com/CVE-2019-5079/): Memory corruption in WAGO PFC100 (critical 9.8)
- [CVE-2019-5081](https://insights.sbomify.com/CVE-2019-5081/): Memory corruption in WAGO PFC100 (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-5080 and fix it if it is affected.

What it is: CVE-2019-5080 is a critical denial of service vulnerability in WAGO PFC100, published on 18 Dec 2019. 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-2019-5080 in the wild and no public exploit code.

Affected product: WAGO PFC100. 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-2019-5080/ (Markdown: https://insights.sbomify.com/CVE-2019-5080/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-5080
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-5080
- OSV: https://osv.dev/vulnerability/CVE-2019-5080

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-5080/
Summaries are generated and may contain mistakes; the official description above is the record.