CVE-2021-34146 Denial of service in n/a
Attackers in radio range can crash Cypress Bluetooth devices by flooding them with unsolicited LMP packets, causing a 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-2021-34146?
CVE-2021-34146 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 CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.
Which versions are affected by CVE-2021-34146?
It affects 2 products.
Products include Cypress Cyw20735b1 Firmware, Cypress Cyw920735q60evb-01 Firmware.
How do I fix CVE-2021-34146?
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-2021-34146 being exploited?
There is no known exploitation of CVE-2021-34146 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2021-34146, GHSA-jg54-6p86-rp5q, UBUNTU-CVE-2021-34146.