# CVE-2020-12505: WAGO: Vulnerability in web-based authentication in WAGO 750-8XX Version <= FW07

> Unauthenticated attackers can modify special parameters on WAGO 750-8XX series controllers due to improper authentication mechanisms.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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:** 30 Sep 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-8wf3-m6g4-jx6p

## What is CVE-2020-12505?

CVE-2020-12505 is a high-severity missing authorization vulnerability in WAGO 750-831/xxx-xxx, published on 30 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Authentication vulnerability in WAGO 750-8XX series with FW version <= FW07 allows an attacker to change some special parameters without authentication. This issue affects: WAGO 750-852, WAGO 750-880/xxx-xxx, WAGO 750-881, WAGO 750-831/xxx-xxx, WAGO 750-882, WAGO 750-885/xxx-xxx, WAGO 750-889 in versions FW07 and below.

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

## Which versions are affected by CVE-2020-12505?

It affects 7 products.


Products: Wago 750-831 Firmware, Wago 750-852 Firmware, Wago 750-880 Firmware, Wago 750-881 Firmware, Wago 750-882 Firmware, Wago 750-885 Firmware, Wago 750-889 Firmware.

## How do I fix CVE-2020-12505?

No fix has been published for CVE-2020-12505 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-12505 being exploited?

There is no known exploitation of CVE-2020-12505 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-12505 and fix it if it is affected.

What it is: CVE-2020-12505 is a high-severity missing authorization vulnerability in WAGO 750-831/xxx-xxx, published on 30 Sep 2020. 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-2020-12505 in the wild and no public exploit code.

Affected product: WAGO 750-831/xxx-xxx. 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-2020-12505/ (Markdown: https://insights.sbomify.com/CVE-2020-12505/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-12505
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-12505
- OSV: https://osv.dev/vulnerability/CVE-2020-12505

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-12505/
Summaries are generated and may contain mistakes; the official description above is the record.