Truncated L2CAP K-frame causes assertion failure

published 2021-10-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26777

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits: 0; none known

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

Patch / fix

fixed in 1 links 1

zephyrproject zephyr 2.6.0

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fx88-6c… advisory

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

zephyrproject-rtos zephyr

Classification

Weakness

CWE-130 Improper Handling of Length Parameter Inconsistency
CWE-617 Reachable Assertion

References

github.com /zephyrproject-rtos/zephyr/security/advisories/GHSA-fx88-6c29-vrp3
patch, third-party-advisory

Sources

CVE List CVE-2021-3454
NVD CVE-2021-3454

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary