CVE-2021-3658

Publication date 28 July 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bluez	22.04 LTS jammy	Not affected
	21.10 impish	Fixed 5.60-0ubuntu2.1
	21.04 hirsute	Fixed 5.56-0ubuntu4.3
	20.04 LTS focal	Fixed 5.53-0ubuntu3.4
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

Notes

mdeslaur

probably introduced by this commit: https://github.com/bluez/bluez/commit/d04eb02f9bad8795297210ef80e262be16ea8f07 so bionic and older aren't vulnerable

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
bluez	Upstream: ?id=b49

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N