VDB
CVE-2021-34147
CVE-2021-34147
PUBLISHED
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.
EPSS 0.10% · 27.4th percentile
Risk Scores
EPSS Score
0.10%
27.4th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:22.04:LTS | bluez-firmware | 0, 1.2-7 |
Exploit Intelligence
- https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices (circl)
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdf (circl)
- vuln_scanner.py (github-poc)
- vuln_scanner.py (github-poc)
- vuln_scanner.py (github-poc)
- vuln_scanner.py (github-poc)
- vuln_scanner.py (github-poc)
Timeline
- Sep 7, 2021 EPSS Score
- Sep 7, 2021 CVE Published
- Nov 4, 2021 EPSS Score
- Jan 1, 2022 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 27, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Apr 26, 2022 EPSS Score
- Jun 23, 2022 EPSS Score
- Aug 21, 2022 EPSS Score
- Oct 17, 2022 EPSS Score
- Dec 14, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-34147 third-party-advisory
- https://github.com/RPi-Distro/bluez-firmware/commit/31ad68831357d2019624004f1f0846475671088f third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-34147 third-party-advisory