{"id":"UBUNTU-CVE-2021-34147","details":"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.","modified":"2025-09-08T16:47:13Z","published":"2021-09-07T07:15:00Z","upstream":["CVE-2021-34147"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-34147"},{"type":"REPORT","url":"https://github.com/RPi-Distro/bluez-firmware/commit/31ad68831357d2019624004f1f0846475671088f"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-34147"}],"affected":[{"package":{"name":"bluez-firmware","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/bluez-firmware@1.2-7?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2-7"],"ecosystem_specific":{"binaries":[{"binary_name":"bluez-firmware","binary_version":"1.2-7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34147.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}