CVE-2021-3330

Name: CVE-2021-3330
Creator: NVD / NIST
Published: 2021-10-12T22:15:08.15+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.59%

Last modified Jun 17, 2026

CVE-2021-3330 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. RCE/DOS: Linked-list corruption leading to large out-of-bounds write while sorting for forged fragment list in Zephyr. Zephyr versions >= >=2.4.0 contain Out-of-bounds Write (CWE-787). EPSS estimates a 0.59% chance of exploitation in the next 30 days.

Description

RCE/DOS: Linked-list corruption leading to large out-of-bounds write while sorting for forged fragment list in Zephyr. Zephyr versions >= >=2.4.0 contain Out-of-bounds Write (CWE-787). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj4r-373f-9456

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.59%

43.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zephyrproject	Zephyr	>= 2.4.0, < 2.5.0

References

http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj4r-373f-9456Exploit, Patch, Third Party Advisory
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj4r-373f-9456Exploit, Patch, Third Party Advisory

Timeline

Published: Oct 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3330?

How severe is CVE-2021-3330?

CVE-2021-3330 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.59% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3330?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3330?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST