# CVE-2020-12069: CODESYS V3 prone to Inadequate Password Hashing

> A local attacker can exploit weak password hashing in CODESYS V3 to gain full control of the device.

- **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:** 26 Dec 2022
- **Updated:** 14 Apr 2025
- **Also known as:** GHSA-26j2-2wp8-h95h

## What is CVE-2020-12069?

CVE-2020-12069 is a high-severity vulnerability in CODESYS V3  containing the CmpUserMgr, published on 26 Dec 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In CODESYS V3 products in all versions prior V3.5.16.0 containing the CmpUserMgr, the CODESYS Control runtime system stores the online communication passwords using a weak hashing algorithm. This can be used by a local attacker with low privileges to gain full control of the device.

Weakness: CWE-916 (Use of Password Hash With Insufficient Computational Effort)

## Which versions are affected by CVE-2020-12069?

It affects 64 products.


Products: Codesys Control for Beaglebone, Codesys Control for Empc-A\/Imx6, Codesys Control for Iot2000, Codesys Control for Linux, Codesys Control for Pfc100, Codesys Control for Pfc200, Codesys Control for Plcnext, Codesys Control for Raspberry Pi, Codesys Control Rte V3, Codesys Control V3 Runtime System Toolkit, Codesys Control Win V3, Codesys Hmi V3, Codesys V3 Simulation Runtime, Festo Controller Cecc-D Firmware, Festo Controller Cecc-Lk Firmware, Festo Controller Cecc-S Firmware, Pilz Pmc, Wago 750-8100 Firmware, Wago 750-8101 Firmware, Wago 750-8102 Firmware and 44 more.

## How do I fix CVE-2020-12069?

No fix has been published for CVE-2020-12069 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-12069 being exploited?

There is no known exploitation of CVE-2020-12069 in the wild and no public exploit code.

## Other vulnerabilities in CODESYS V3  containing the CmpUserMgr

- [CVE-2020-10245](https://insights.sbomify.com/CVE-2020-10245/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-18858](https://insights.sbomify.com/CVE-2019-18858/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-13548](https://insights.sbomify.com/CVE-2019-13548/): Memory corruption in CODESYS V3 web server (critical 9.8)
- [CVE-2018-25048](https://insights.sbomify.com/CVE-2018-25048/): Codesys Runtime Improper Limitation of a Pathname (high 8.8)
- [CVE-2019-9008](https://insights.sbomify.com/CVE-2019-9008/): Privilege escalation in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-12069 and fix it if it is affected.

What it is: CVE-2020-12069 is a high-severity vulnerability in CODESYS V3  containing the CmpUserMgr, published on 26 Dec 2022. 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-2020-12069 in the wild and no public exploit code.

Affected product: CODESYS V3  containing the CmpUserMgr. 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-2020-12069/ (Markdown: https://insights.sbomify.com/CVE-2020-12069/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-12069
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-12069
- OSV: https://osv.dev/vulnerability/CVE-2020-12069

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-12069/
Summaries are generated and may contain mistakes; the official description above is the record.