CVE-2021-3436

Name: CVE-2021-3436
Creator: NVD / NIST
Published: 2021-10-05T21:15:09.293+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2021-3436 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. BT: Possible to overwrite an existing bond during keys distribution phase when the identity address of the bond is known. Zephyr versions >= 1.14.2, >= 2.4.0, >= 2.5.0 contain Use of Multiple Resources with Duplicate Identifier (CWE-694). EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

BT: Possible to overwrite an existing bond during keys distribution phase when the identity address of the bond is known. Zephyr versions >= 1.14.2, >= 2.4.0, >= 2.5.0 contain Use of Multiple Resources with Duplicate Identifier (CWE-694). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-j76f-35mc-4h63

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.95%

56.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-694

Affected Software

Vendor	Product	Versions
Zephyrproject	Zephyr	1.14.2
Zephyrproject	Zephyr	2.4.0
Zephyrproject	Zephyr	2.5.0

References

http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-j76f-35mc-4h63Exploit, Patch, Third Party Advisory
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-j76f-35mc-4h63Exploit, Patch, Third Party Advisory

Timeline

Published: Oct 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3436?

How severe is CVE-2021-3436?

CVE-2021-3436 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3436?

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-2021-3436?

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

Scan your code now

Source: NVD / NIST