CVE-2021-3329 DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer
Attackers can crash the Bluetooth host layer in Zephyr RTOS by sending a malformed initial HCI ACL_MTU handshake packet.
- 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-2021-3329?
CVE-2021-3329 is a critical denial of service vulnerability in Zephyrproject Zephyr, published on 26 Feb 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack
Which versions are affected by CVE-2021-3329?
It affects 1 product.
Products include Zephyrproject Zephyr.
How do I fix CVE-2021-3329?
No fix has been published for CVE-2021-3329 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-3329 being exploited?
There is no known exploitation of CVE-2021-3329 in the wild and no public exploit code.
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-2023-0397 DoS: Invalid Initialization in le_read_buffer_size_complete
Sources
Also known as GHSA-gmxc-973j-62f2.