What’s Vulnerable › Vulnerabilities

CVE-2021-3966: Usb bluetooth device ACL read cb buffer overflow

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-01-11 · updated 2026-06-17
• Weakness: CWE-122

Description

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

Affected products

• zephyrproject zephyr: before 3.0.0 — fixed in 3.0.0

How to fix

Upgrade to a fixed version: zephyrproject zephyr 3.0.0. Check the vendor advisory for mitigations.

References

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

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