What is CVE-2021-3966?

CVE-2021-3966 is a critical-severity vulnerability in Zephyrproject-rtos Zephyr, classified under Heap-based Buffer Overflow. CVSS score: 9.6/10. Published 2023-01-11.

How severe is CVE-2021-3966?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Is CVE-2021-3966 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Zephyrproject-rtos Zephyr

CVE-2021-3966

usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.

Vulnerability class: Buffer Overflow

EPSS: 0.001 (30.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H.

Affected products

Zephyrproject-rtos Zephyr — versions unspecified

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hfxq-3w6x-fv2m

Frequently asked questions

What is CVE-2021-3966?: CVE-2021-3966 is a critical-severity vulnerability in Zephyrproject-rtos Zephyr, classified under Heap-based Buffer Overflow. CVSS score: 9.6/10. Published 2023-01-11.
How severe is CVE-2021-3966?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2021-3966 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.