CVE-2021-43400: Bluez

Critical severity, CVSS 9.1. EPSS: 1.7% chance of exploitation in the next 30 days.

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.

Affected products

• Bluez Bluez: version 5.61 only
• Debian Debian Linux: version 10.0 only

Published 2021-11-04. Last modified 2026-06-17.