CVE-2021-34148 Denial of service in n/a
Attackers in radio range can crash Cypress WICED BT stack firmware on CYW20735B1 devices by sending crafted LMP packets, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-34148?
CVE-2021-34148 is a medium-severity denial of service vulnerability in n/a, published on 7 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with a greater ACL Length after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.
Which versions are affected by CVE-2021-34148?
It affects 1 product.
Products include Cypress Wireless Internet Connectivity for Embedded Devices.
How do I fix CVE-2021-34148?
Apply the vendor's patch.
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-2021-34148 being exploited?
There is no known exploitation of CVE-2021-34148 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2021-34148, GHSA-6539-6fh5-h34x, UBUNTU-CVE-2021-34148.