Buffer overflow in usb device class

published 2022-02-07 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27082

cvss: 8.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits: 0; none known

Buffer overflow in usb device class. Zephyr versions >= v2.6.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fm6v-8625-99jf

Patch / fix

fixed in 1

zephyrproject zephyr 2.7.1

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fm6v-8625-99jf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.2	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	5.8	AV:A/AC:L/Au:N/C:P/I:P/A:P

Affected products

zephyrproject-rtos zephyr

Classification

Weakness

CWE-122 Heap-based Buffer Overflow
CWE-787 Out-of-bounds Write

References

github.com /zephyrproject-rtos/zephyr/security/advisories/GHSA-fm6v-8625-99jf
exploit, third-party-advisory

Sources

CVE List CVE-2021-3835
NVD CVE-2021-3835

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