# CVE-2023-43699: Auth bypass in APU0200

> Unrestricted login attempts in SICK APU allow remote attackers to guess passwords and gain unauthorized access.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Oct 2023
- **Updated:** 9 Dec 2024
- **Also known as:** GHSA-cfjm-49ph-8gv8

## What is CVE-2023-43699?

CVE-2023-43699 is a high-severity authentication bypass vulnerability in SICK AG APU0200, published on 9 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Restriction of Excessive Authentication Attempts in RDT400 in SICK APU
allows an unprivileged remote attacker to guess the password via trial-and-error as the login attempts
are not limited.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2023-43699?

It affects 1 product.


Products: Sick Apu0200 Firmware.

## How do I fix CVE-2023-43699?

No fix has been published for CVE-2023-43699 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43699 being exploited?

There is no known exploitation of CVE-2023-43699 in the wild and no public exploit code.

## Other vulnerabilities in SICK AG APU0200

- [CVE-2023-43696](https://insights.sbomify.com/CVE-2023-43696/): Missing authorization in APU0200 (high 8.2)
- [CVE-2023-43700](https://insights.sbomify.com/CVE-2023-43700/): Missing authorization in APU0200 (high 7.7)
- [CVE-2023-43698](https://insights.sbomify.com/CVE-2023-43698/): Cross-site scripting in APU0200 (high 7.1)
- [CVE-2023-43697](https://insights.sbomify.com/CVE-2023-43697/): Path traversal in APU0200 (medium 6.5)
- [CVE-2023-5100](https://insights.sbomify.com/CVE-2023-5100/): Information disclosure in APU0200 (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43699 and fix it if it is affected.

What it is: CVE-2023-43699 is a high-severity authentication bypass vulnerability in SICK AG APU0200, published on 9 Oct 2023. 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-2023-43699 in the wild and no public exploit code.

Affected product: SICK AG APU0200. 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-2023-43699/ (Markdown: https://insights.sbomify.com/CVE-2023-43699/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43699
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43699
- OSV: https://osv.dev/vulnerability/CVE-2023-43699

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43699/
Summaries are generated and may contain mistakes; the official description above is the record.