What is CVE-2021-3319?

CVE-2021-3319 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-10-05.

How severe is CVE-2021-3319?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Zephyrproject Zephyr

CVE-2021-3319

DOS: Incorrect 802154 Frame Validation for Omitted Source / Dest Addresses. Zephyr versions >= > v2.4.0 contain NULL Pointer Dereference (CWE-476), Attempt to Access Child of a Non-structure Pointer (CWE-588). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-94jg-2p6q-5364

Published 2021-10-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Zephyrproject Zephyr
Zephyrproject-Rtos Zephyr — versions > v2.4.0

Weakness classification (CWE)

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-94jg-2p6q-5364 (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3319?: CVE-2021-3319 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-10-05.
How severe is CVE-2021-3319?: Medium severity. CVSS v3 base score is 6.5 out of 10.