What is CVE-2021-3322?

CVE-2021-3322 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-10-12.

How severe is CVE-2021-3322?

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

NULL pointer dereference in Zephyrproject Zephyr

CVE-2021-3322

Unexpected Pointer Aliasing in IEEE 802154 Fragment Reassembly in Zephyr. Zephyr versions >= >=2.4.0 contain NULL Pointer Dereference (CWE-476). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p86r-gc4r-4mq3

Published 2021-10-12 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.005 (43.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Zephyrproject Zephyr
Zephyrproject-Rtos Zephyr — versions >=2.4.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p86r-gc4r-4mq3 (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3322?: CVE-2021-3322 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-10-12.
How severe is CVE-2021-3322?: Medium severity. CVSS v3 base score is 6.5 out of 10.