CVE-2021-34147 Denial of service in n/a
Attackers can crash Bluetooth devices by sending malformed LMP timing accuracy responses and reconnecting, exhausting resources in Cypress WICED BT stack.
- 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-2021-34147?
CVE-2021-34147 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 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress.
Which versions are affected by CVE-2021-34147?
It affects 1 product.
Products include Cypress Wireless Internet Connectivity for Embedded Devices.
How do I fix CVE-2021-34147?
Upgrade to a fixed version.
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-2021-34147 being exploited?
There is no known exploitation of CVE-2021-34147 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2021-34147, GHSA-m739-9w4c-mx4g, UBUNTU-CVE-2021-34147.