# CVE-2023-1620: WAGO: DoS in multiple products in multiple versions using Codesys

> Authenticated high-privilege attackers can cause denial of service on WAGO devices by sending crafted packets to the CODESYS runtime.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2023
- **Updated:** 12 Nov 2024
- **Also known as:** GHSA-vhfw-j3c3-cmgg

## What is CVE-2023-1620?

CVE-2023-1620 is a medium-severity denial of service vulnerability in Wago 750-331, published on 26 Jun 2023. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Multiple WAGO devices in multiple versions may allow an authenticated remote attacker with high privileges to DoS the device by sending a specifically crafted packet to the CODESYS V2 runtime.

Weakness: CWE-1288 (Improper Validation of Consistency within Input)

## Which versions are affected by CVE-2023-1620?

It affects 76 products.


Products: Wago 750-331 Firmware, Wago 750-8202\/000-011 Firmware, Wago 750-8202\/000-012 Firmware, Wago 750-8202\/000-022 Firmware, Wago 750-8202\/025-000 Firmware, Wago 750-8202\/025-001 Firmware, Wago 750-8202\/025-002 Firmware, Wago 750-8202\/040-000 Firmware, Wago 750-8202\/040-001 Firmware, Wago 750-8202 Firmware, Wago 750-8203\/025-000 Firmware, Wago 750-8203 Firmware, Wago 750-8204\/025-000 Firmware, Wago 750-8204 Firmware, Wago 750-8206\/025-000 Firmware, Wago 750-8206\/025-001 Firmware, Wago 750-8206\/040-000 Firmware, Wago 750-8206\/040-001 Firmware, Wago 750-8206 Firmware, Wago 750-8207\/025-000 Firmware and 56 more.

## How do I fix CVE-2023-1620?

No fix has been published for CVE-2023-1620 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-1620 being exploited?

There is no known exploitation of CVE-2023-1620 in the wild and no public exploit code.

## Other vulnerabilities in Wago 750-331

- [CVE-2020-12516](https://insights.sbomify.com/CVE-2020-12516/): WAGO: PLC families 750-88x and 750-352 prone to DoS attack (high 7.5)
- [CVE-2023-1619](https://insights.sbomify.com/CVE-2023-1619/): WAGO: DoS in multiple versions of multiple products (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-1620 and fix it if it is affected.

What it is: CVE-2023-1620 is a medium-severity denial of service vulnerability in Wago 750-331, published on 26 Jun 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-1620 in the wild and no public exploit code.

Affected product: Wago 750-331. 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-2023-1620/ (Markdown: https://insights.sbomify.com/CVE-2023-1620/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-1620
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-1620
- OSV: https://osv.dev/vulnerability/CVE-2023-1620

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-1620/
Summaries are generated and may contain mistakes; the official description above is the record.