# CVE-2023-33868: PiiGAB M-Bus Improper Restriction of Excessive Authentication Attempts

> Attackers can brute force HTTP basic authentication due to missing login attempt limits, potentially gaining unauthorized access to the system.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/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:** 6 Jul 2023
- **Updated:** 24 Oct 2024
- **Also known as:** GHSA-vvgv-54pp-4xr8

## What is CVE-2023-33868?

CVE-2023-33868 is a medium-severity authentication bypass vulnerability in PiiGAB  M-Bus SoftwarePack, published on 6 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The number of login attempts is not limited. This could allow an attacker to perform a brute force on HTTP basic authentication.

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

## Which versions are affected by CVE-2023-33868?

It affects 1 product.


Products: Piigab M-Bus 900s Firmware.

## How do I fix CVE-2023-33868?

No fix has been published for CVE-2023-33868 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-33868 being exploited?

There is no known exploitation of CVE-2023-33868 in the wild and no public exploit code.

## Other vulnerabilities in PiiGAB  M-Bus SoftwarePack

- [CVE-2023-35987](https://insights.sbomify.com/CVE-2023-35987/): PiiGAB M-Bus Use of Hard-coded Credentials (critical 9.8)
- [CVE-2023-35120](https://insights.sbomify.com/CVE-2023-35120/): PiiGAB M-Bus Cross-Site Request Forgery (high 8.8)
- [CVE-2023-36859](https://insights.sbomify.com/CVE-2023-36859/): PiiGAB M-Bus Code Injection (high 8.8)
- [CVE-2023-32652](https://insights.sbomify.com/CVE-2023-32652/): PiiGAB M-Bus Cross-site Scripting (high 8.0)
- [CVE-2023-31277](https://insights.sbomify.com/CVE-2023-31277/): PiiGAB M-Bus Unprotected Transport of Credentials (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-33868 and fix it if it is affected.

What it is: CVE-2023-33868 is a medium-severity authentication bypass vulnerability in PiiGAB  M-Bus SoftwarePack, published on 6 Jul 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-2023-33868 in the wild and no public exploit code.

Affected product: PiiGAB  M-Bus SoftwarePack. 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-2023-33868/ (Markdown: https://insights.sbomify.com/CVE-2023-33868/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-33868
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-33868
- OSV: https://osv.dev/vulnerability/CVE-2023-33868

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-33868/
Summaries are generated and may contain mistakes; the official description above is the record.