# CVE-2019-5178: Memory corruption in WAGO PFC200

> A stack buffer overflow in the WAGO PFC200 iocheckd service allows remote attackers to execute arbitrary code or cause a denial of service via crafted packets.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Mar 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-7cxx-87x4-wr3r

## What is CVE-2019-5178?

CVE-2019-5178 is a high-severity memory corruption vulnerability in WAGO PFC200, published on 11 Mar 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An exploitable stack buffer overflow vulnerability vulnerability exists in the iocheckd service ‘I/O-Check’ functionality of WAGO PFC 200 Firmware version 03.02.02(14). An attacker can send a specially crafted packet to trigger the parsing of this cache file. The destination buffer sp+0x440 is overflowed with the call to sprintf() for any hostname values that are greater than 1024-len(‘/etc/config-tools/change_hostname hostname=‘) in length. A hostname value of length 0x3fd will cause the service to crash.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2019-5178?

It affects 1 product.


Products: Wago Pfc200 Firmware.

## How do I fix CVE-2019-5178?

No fix has been published for CVE-2019-5178 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-5178 being exploited?

There is no known exploitation of CVE-2019-5178 in the wild and no public exploit code.

## Other vulnerabilities in WAGO PFC200

- [CVE-2018-5459](https://insights.sbomify.com/CVE-2018-5459/): Auth bypass in WAGO PFC200 Series (critical 9.8)
- [CVE-2019-5160](https://insights.sbomify.com/CVE-2019-5160/): Server-side request forgery in WAGO PFC200 Firmware (critical 9.1)
- [CVE-2019-5161](https://insights.sbomify.com/CVE-2019-5161/): Code injection in WAGO PFC200 Firmware (critical 9.1)
- [CVE-2019-5184](https://insights.sbomify.com/CVE-2019-5184/): Use after free in Wago (high 7.8)
- [CVE-2019-5169](https://insights.sbomify.com/CVE-2019-5169/): Command injection in WAGO PFC200 (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-5178 and fix it if it is affected.

What it is: CVE-2019-5178 is a high-severity memory corruption vulnerability in WAGO PFC200, published on 11 Mar 2020. 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-2019-5178 in the wild and no public exploit code.

Affected product: WAGO PFC200. 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-2019-5178/ (Markdown: https://insights.sbomify.com/CVE-2019-5178/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-5178
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-5178
- OSV: https://osv.dev/vulnerability/CVE-2019-5178

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-5178/
Summaries are generated and may contain mistakes; the official description above is the record.