CVE-2021-3581: Buffer Access with Incorrect Length Value in zephyr

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-05 · updated 2026-06-17
Weakness: CWE-805

Description

Buffer Access with Incorrect Length Value in zephyr. Zephyr versions >= >=2.5.0 contain Buffer Access with Incorrect Length Value (CWE-805). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8q65-5gqf-fmw5

Affected products

zephyrproject zephyr: from 2.5.0 before 2.6.0 — fixed in 2.6.0

How to fix

Upgrade to a fixed version: zephyrproject zephyr 2.6.0. Check the vendor advisory for mitigations.

References

http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8q65-5gqf-fmw5
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8q65-5gqf-fmw5

Get alerted when CVE-2021-3581 or the next vulnerability affects your stack