What is CVE-2024-6443?

CVE-2024-6443 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Read. CVSS score: 6.3/10. Published 2024-10-04.

How severe is CVE-2024-6443?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Out-of-bounds Read in Zephyrproject Zephyr

CVE-2024-6443

In utf8_trunc in zephyr/lib/utils/utf8.c, last_byte_p can point to one byte before the string pointer if the string is empty.

Vulnerability class: Buffer Overflow

Published 2024-10-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (47.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-gg46-3rh2-v765 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2024-6443?: CVE-2024-6443 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Read. CVSS score: 6.3/10. Published 2024-10-04.
How severe is CVE-2024-6443?: Medium severity. CVSS v3 base score is 6.3 out of 10.