CVE-2021-3658

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-03-02 · updated 2026-06-17
Weakness: CWE-863

Description

bluetoothd from bluez incorrectly saves adapters' Discoverable status when a device is powered down, and restores it when powered up. If a device is powered down while discoverable, it will be discoverable when powered on again. This could lead to inadvertent exposure of the bluetooth stack to physically nearby attackers.

Affected products

BlueZ: before 5.61 — fixed in 5.61
Fedoraproject Fedora: 34

How to fix

Upgrade to a fixed version: BlueZ 5.61. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1984728
https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=b497b5942a8beb8f89ca1c359c54ad67ec843055
https://github.com/bluez/bluez/commit/b497b5942a8beb8f89ca1c359c54ad67ec843055
https://gitlab.gnome.org/GNOME/gnome-bluetooth/-/issues/89
https://security.netapp.com/advisory/ntap-20220407-0002/
https://bugzilla.redhat.com/show_bug.cgi?id=1984728
https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=b497b5942a8beb8f89ca1c359c54ad67ec843055
https://github.com/bluez/bluez/commit/b497b5942a8beb8f89ca1c359c54ad67ec843055
https://gitlab.gnome.org/GNOME/gnome-bluetooth/-/issues/89
https://lists.debian.org/debian-lts-announce/2024/09/msg00022.html
https://security.netapp.com/advisory/ntap-20220407-0002/

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