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Fencer Vulns
medium 6.5

CVE-2021-3658 json

bluetoothd from bluez incorrectly saves adapters' Discoverable status when a device is powered down, and restores it when powered up.

published 2022-03-02 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26953

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

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.

Patch / fix

  • bluez bluez 5.61
  • bluez Debian 14, Debian 13, Debian 12 5.61-1

debian advisories DEBIAN-CVE-2021-3658

  • bluez Ubuntu 20.04 LTS 5.53-0ubuntu3.4

ubuntu advisories UBUNTU-CVE-2021-3658

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bluez SLE Workstation Extension 15 SP3, SLE Module for Desktop Applications 15 SP3, SLE Module for Basesystem 15 SP3 +1 more 5.55-150300.3.14.1
  • bluez SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 5.48-150200.13.17.1
  • bluez SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 5.48-150000.5.41.1

suse advisories SUSE-SU-2022:3981-1SUSE-SU-2022:3691-1SUSE-SU-2022:3687-1

  • bluez Arch Linux 5.61-1

arch linux advisories AVG-2231

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3658 updated cvss 4.6

bluez: adapter incorrectly restores Discoverable state after powered down

  • Red Hat Enterprise Linux 6 bluez, bluez-alsa, bluez-cups, bluez-libs, bluez-compat, bluez-gstreamer Red Hat Enterprise Linux 7 bluez, bluez-cups, bluez-libs, bluez-hid2hci
    affected: workaround, no fix planned “If bluetooth is disabled or never powered on, this vulnerability is not exposed.”
  • Red Hat Enterprise Linux 8 bluez, bluez-cups, bluez-libs, bluez-obexd, bluez-hid2hci Red Hat Enterprise Linux 9 bluez, bluez-cups, bluez-libs, bluez-obexd
    affected: workaround, no fix available “If bluetooth is disabled or never powered on, this vulnerability is not exposed.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 3.3 AV:A/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a bluez

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.