What is CVE-2021-3455?

CVE-2021-3455 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 4.3/10. Published 2021-10-19.

How severe is CVE-2021-3455?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Use After Free in Zephyrproject Zephyr

CVE-2021-3455

Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions >= 2.4.0, >= 2.5.0 contain Use After Free (CWE-416). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp

Vulnerability class: Use-After-Free

EPSS: 0.011 (61.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Zephyrproject Zephyr
Zephyrproject-rtos Zephyr — versions 2.4.0, 2.5.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

vulnerabilities@zephyrproject.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-3455?: CVE-2021-3455 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 4.3/10. Published 2021-10-19.
How severe is CVE-2021-3455?: Medium severity. CVSS v3 base score is 4.3 out of 10.