# CVE-2023-35987: PiiGAB M-Bus Use of Hard-coded Credentials

> Attackers can exploit hard-coded credentials in PiiGAB M-Bus SoftwarePack to bypass authentication and gain unauthorized access.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 6 Jul 2023
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-pr5p-f98w-w666

## What is CVE-2023-35987?

CVE-2023-35987 is a critical 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

PiiGAB M-Bus contains hard-coded credentials which it uses for authentication.

Weakness: CWE-798 (Use of Hard-coded Credentials)

## Which versions are affected by CVE-2023-35987?

It affects 1 product.


Products: Piigab M-Bus 900s Firmware.

## How do I fix CVE-2023-35987?

No fix has been published for CVE-2023-35987 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-35987 being exploited?

There is no known exploitation of CVE-2023-35987 in the wild and no public exploit code.

## Other vulnerabilities in PiiGAB  M-Bus SoftwarePack

- [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)
- [CVE-2023-34433](https://insights.sbomify.com/CVE-2023-34433/): PiiGAB M-Bus Use of Password Hash With Insufficient Computational Effort (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-35987 and fix it if it is affected.

What it is: CVE-2023-35987 is a critical 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-2023-35987 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-2023-35987/ (Markdown: https://insights.sbomify.com/CVE-2023-35987/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-35987
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-35987
- OSV: https://osv.dev/vulnerability/CVE-2023-35987

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-35987/
Summaries are generated and may contain mistakes; the official description above is the record.