CVE-2023-30546

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 53% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
—
EPSS
46.8%
KEV
Not listed

Published

April 26, 2023

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 13, 2026
Patch available. Sources: github_pr, github.
github Patch Available

Off-by-one error in Antelope DBMS · Advisory · contiki-ng/contiki-ng · GitHub

https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-257g-w39m-5jj4
github_pr Patch Available

antelope,storage-cfs: Fix length of filename array

Patch available: contiki-ng/contiki-ng release/v4.9 (PR #2425 merged 2023-04-14)

https://github.com/contiki-ng/contiki-ng/pull/2425

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-22 23:09 UTCEG score recompute
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Frequently asked(5)

What is CVE-2023-30546?
CVE-2023-30546 is a critical vulnerability published on April 26, 2023. 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…
When was CVE-2023-30546 disclosed?
CVE-2023-30546 was first published in the National Vulnerability Database on April 26, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-30546 actively exploited?
CVE-2023-30546 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 46.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-30546?
CVE-2023-30546 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-30546?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-30546, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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