{"id":"UBUNTU-CVE-2021-43400","details":"An issue was discovered in gatt-database.c in BlueZ 5.61. A use-after-free can occur when a client disconnects during D-Bus processing of a WriteValue call.","modified":"2026-04-22T14:59:39.649982Z","published":"2021-11-04T23:15:00Z","related":["USN-5155-1"],"upstream":["CVE-2021-43400"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-43400"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5155-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-43400"}],"affected":[{"package":{"name":"bluez","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/bluez@5.37-0ubuntu5.3+esm5?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.35-0ubuntu2","5.36-0ubuntu1","5.37-0ubuntu5","5.37-0ubuntu5.1","5.37-0ubuntu5.3","5.37-0ubuntu5.3+esm1","5.37-0ubuntu5.3+esm2","5.37-0ubuntu5.3+esm3","5.37-0ubuntu5.3+esm4","5.37-0ubuntu5.3+esm5"],"ecosystem_specific":{"binaries":[{"binary_name":"bluetooth","binary_version":"5.37-0ubuntu5.3+esm5"},{"binary_name":"bluez","binary_version":"5.37-0ubuntu5.3+esm5"},{"binary_name":"bluez-cups","binary_version":"5.37-0ubuntu5.3+esm5"},{"binary_version":"5.37-0ubuntu5.3+esm5","binary_name":"bluez-hcidump"},{"binary_name":"bluez-obexd","binary_version":"5.37-0ubuntu5.3+esm5"},{"binary_name":"bluez-tests","binary_version":"5.37-0ubuntu5.3+esm5"},{"binary_name":"libbluetooth3","binary_version":"5.37-0ubuntu5.3+esm5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43400.json"}},{"package":{"name":"bluez","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/bluez@5.48-0ubuntu3.6?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.48-0ubuntu3.6"}]}],"versions":["5.46-0ubuntu3","5.46-0ubuntu4","5.48-0ubuntu3","5.48-0ubuntu3.1","5.48-0ubuntu3.2","5.48-0ubuntu3.3","5.48-0ubuntu3.4","5.48-0ubuntu3.5"],"ecosystem_specific":{"binaries":[{"binary_name":"bluetooth","binary_version":"5.48-0ubuntu3.6"},{"binary_name":"bluez","binary_version":"5.48-0ubuntu3.6"},{"binary_name":"bluez-cups","binary_version":"5.48-0ubuntu3.6"},{"binary_name":"bluez-hcidump","binary_version":"5.48-0ubuntu3.6"},{"binary_name":"bluez-obexd","binary_version":"5.48-0ubuntu3.6"},{"binary_name":"bluez-tests","binary_version":"5.48-0ubuntu3.6"},{"binary_name":"libbluetooth3","binary_version":"5.48-0ubuntu3.6"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43400.json"}},{"package":{"name":"bluez","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/bluez@5.53-0ubuntu3.4?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.53-0ubuntu3.4"}]}],"versions":["5.50-0ubuntu4","5.51-0ubuntu1","5.51-0ubuntu2","5.52-0ubuntu1","5.52-0ubuntu2","5.53-0ubuntu1","5.53-0ubuntu2","5.53-0ubuntu3","5.53-0ubuntu3.1","5.53-0ubuntu3.2","5.53-0ubuntu3.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"bluetooth","binary_version":"5.53-0ubuntu3.4"},{"binary_name":"bluez","binary_version":"5.53-0ubuntu3.4"},{"binary_name":"bluez-cups","binary_version":"5.53-0ubuntu3.4"},{"binary_name":"bluez-hcidump","binary_version":"5.53-0ubuntu3.4"},{"binary_name":"bluez-obexd","binary_version":"5.53-0ubuntu3.4"},{"binary_name":"bluez-tests","binary_version":"5.53-0ubuntu3.4"},{"binary_name":"libbluetooth3","binary_version":"5.53-0ubuntu3.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43400.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}