CVE-2021-3966
Usb bluetooth device ACL read cb buffer overflow
usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Usb bluetooth device ACL read cb buffer overflow
usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.
- Record
CVE-2021-3966- CVSS 3.1
- 9.6 Critical
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2021-27171
usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.
- Record
EUVD-2021-27171- CVSS 3.1
- 9.6 Critical
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H - Updated
- 2026-11-02
NVD
usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.
- Record
CVE-2021-3966- CVSS 3.1
- 9.6 Critical
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122, CWE-120
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3966 is a critical vulnerability (CVSS 9.6) in Zephyrproject Zephyr, published January 11, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 43rd percentile. No source names a fixed version.