# CVE-2023-30546: Contiki-NG has off-by-one error in Antelope DBMS

> An off-by-one error in Contiki-NG's Antelope DBMS allows out-of-bounds memory access, potentially leading to code execution or crashes.

- **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:** 26 Apr 2023
- **Updated:** 30 Jan 2025
- **Also known as:** GHSA-257g-w39m-5jj4

## What is CVE-2023-30546?

CVE-2023-30546 is a critical vulnerability in contiki-ng, published on 26 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Contiki-NG is an operating system for Internet of Things devices. An off-by-one error can be triggered in the Antelope database management system in the Contiki-NG operating system in versions 4.8 and prior. The problem exists in the Contiki File System (CFS) backend for the storage of data (file os/storage/antelope/storage-cfs.c). In the functions `storage_get_index` and `storage_put_index`, a buffer for merging two strings is allocated with one byte less than the maximum size of the merged strings, causing subsequent function calls to the cfs_open function to read from memory beyond the buffer size. The vulnerability has been patched in the "develop" branch of Contiki-NG, and is expected to be included in the next release. As a workaround, the problem can be fixed by applying the patch in Contiki-NG pull request #2425.

Weakness: CWE-193 (Off-by-one Error), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2023-30546?

It affects 1 product.


Products: Contiki-Ng Contiki-Ng.

## How do I fix CVE-2023-30546?

No fix has been published for CVE-2023-30546 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-30546 being exploited?

There is no known exploitation of CVE-2023-30546 in the wild and no public exploit code.

## Other vulnerabilities in contiki-ng

- [CVE-2018-19417](https://insights.sbomify.com/CVE-2018-19417/): Memory corruption in n/a (critical 10.0)
- [CVE-2020-24336](https://insights.sbomify.com/CVE-2020-24336/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14934](https://insights.sbomify.com/CVE-2020-14934/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14935](https://insights.sbomify.com/CVE-2020-14935/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14936](https://insights.sbomify.com/CVE-2020-14936/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-30546 and fix it if it is affected.

What it is: CVE-2023-30546 is a critical vulnerability in contiki-ng, published on 26 Apr 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-2023-30546 in the wild and no public exploit code.

Affected product: contiki-ng. 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-2023-30546/ (Markdown: https://insights.sbomify.com/CVE-2023-30546/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-30546
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-30546
- OSV: https://osv.dev/vulnerability/CVE-2023-30546

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-30546/
Summaries are generated and may contain mistakes; the official description above is the record.