CVE-2021-3966 Usb bluetooth device ACL read cb buffer overflow
A buffer overflow in the Zephyr RTOS USB Bluetooth driver allows attackers to execute arbitrary code or cause a denial of service via malicious USB devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-3966?
CVE-2021-3966 is a critical memory corruption vulnerability in Zephyrproject Zephyr, published on 11 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.
Which versions are affected by CVE-2021-3966?
It affects 1 product.
Products include Zephyrproject Zephyr.
How do I fix CVE-2021-3966?
No fix has been published for CVE-2021-3966 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-3966 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3966 exists.
Other vulnerabilities in Zephyrproject Zephyr
- CVE-2026-5067 Out-of-bounds read/write in HTTP WebSocket upgrade via non-null-terminated Sec-WebSocket-Key
- CVE-2022-3806 Bluetooth HCI Error Handling Double Free
- CVE-2017-14199 Memory corruption in getaddrinfo
- CVE-2018-1000800 Null dereference in n/a
- CVE-2021-3329 DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer