# CVE-2023-30546

## Summary

- **CVE ID:** CVE-2023-30546
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-125, CWE-193
- **Published:** Apr 26, 2023
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- contiki-ng — contiki-ng (<= 4.8)

## References

- [CNA](https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-257g-w39m-5jj4)
- [CNA](https://github.com/contiki-ng/contiki-ng/pull/2425)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 51.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._