CVE-2021-3454: Zephyrproject Zephyr

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

Truncated L2CAP K-frame causes assertion failure. Zephyr versions >= 2.4.0, >= v.2.50 contain Improper Handling of Length Parameter Inconsistency (CWE-130), Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fx88-6c29-vrp3

Affected products

• Zephyrproject Zephyr: from 2.4.0, before 2.6.0 (fixed in 2.6.0)

Published 2021-10-19. Last modified 2026-06-17.