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Fencer Vulns
high 7.1

CVE-2020-0556 json

Improper access control in subsystem for BlueZ before version 5.54 may allow an unauthenticated user to potentially enable escalation of pr…

published 2020-03-12 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-2054

cvss
7.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

Improper access control in subsystem for BlueZ before version 5.54 may allow an unauthenticated user to potentially enable escalation of privilege and denial of service via adjacent access

Patch / fix

  • bluez bluez 5.54
  • bluez Debian 14, Debian 13, Debian 12 5.50-1.1

debian advisories DEBIAN-CVE-2020-0556

  • bluez Ubuntu 16.04 LTS 5.37-0ubuntu5.3
  • bluez Ubuntu 18.04 LTS 5.48-0ubuntu3.4

ubuntu advisories UBUNTU-CVE-2020-0556

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 RHEL 8 5.50-4.el8
  • bluez-cups RHEL 8 5.50-4.el8
  • bluez-libs RHEL 8 5.50-4.el8
  • bluez-obexd RHEL 8 5.50-4.el8
  • bluez-hid2hci RHEL 8 5.50-4.el8
  • bluez RHEL 7 5.44-7.el7
  • bluez-cups RHEL 7 5.44-7.el7
  • bluez-libs RHEL 7 5.44-7.el7

red hat advisories RHSA-2020:4481RHSA-2020:4001

  • bluez SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 5.13-5.23.1
  • bluez SLE Workstation Extension 15 SP2, SLE Module for Desktop Applications 15 SP2, SLE Module for Basesystem 15 SP2 5.48-13.3.1
  • bluez SLE Workstation Extension 15 SP1, SLE Module for Desktop Applications 15 SP1, SLE Module for Basesystem 15 SP1 5.48-5.25.1

suse advisories SUSE-SU-2020:3516-1SUSE-SU-2020:3034-1SUSE-SU-2020:0918-1

  • bluez openSUSE Leap 15.2 5.48-lp152.12.3.1
  • bluez openSUSE Leap 15.1 5.48-lp151.8.12.1

opensuse advisories openSUSE-SU-2020:0872-1openSUSE-SU-2020:0479-1

  • bluez Alpine 3.10 5.50-r4
  • bluez Alpine 3.11 5.52-r1
  • bluez Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 5.54-r0
  • bluez Alpine 3.8 5.49-r3
  • bluez Alpine 3.9 5.50-r1
  • obexd-enhanced Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 5.54-r0

alpine advisories ALPINE-CVE-2020-0556

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bluez Arch Linux 5.54-1

arch linux advisories AVG-1116

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-2020-0556 updated cvss 7.1

bluez: Improper access control in subsystem could result in privilege escalation and DoS

  • Red Hat CodeReady Linux Builder (v. 8) bluez-debuginfo 5.50-4.el8, bluez-libs-devel 5.50-4.el8, bluez-debugsource 5.50-4.el8, bluez-cups-debuginfo 5.50-4.el8, bluez-libs-debuginfo 5.50-4.el8, bluez-obexd-debuginfo 5.50-4.el8, +1 more Red Hat Enterprise Linux AppStream (v. 8) bluez-cups 5.50-4.el8 Red Hat Enterprise Linux BaseOS (v. 8) bluez 5.50-4.el8, bluez-libs 5.50-4.el8, bluez-obexd 5.50-4.el8, bluez-hid2hci 5.50-4.el8
    fixed: vendor fix “Disable Bluetooth. Instructions on disabling bluetooth in Red Hat Enterprise Linux are available at: https://access.redhat.com/solutions/2682931” RHSA-2020:4481
  • Red Hat Enterprise Linux Client (v. 7) bluez 5.44-7.el7, bluez-libs 5.44-7.el7 Red Hat Enterprise Linux Client Optional (v. 7) bluez-cups 5.44-7.el7, bluez-hid2hci 5.44-7.el7 Red Hat Enterprise Linux ComputeNode (v. 7) bluez 5.44-7.el7, bluez-libs 5.44-7.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) bluez 5.44-7.el7, bluez-cups 5.44-7.el7, bluez-hid2hci 5.44-7.el7 Red Hat Enterprise Linux Server (v. 7) bluez 5.44-7.el7, bluez-libs 5.44-7.el7 Red Hat Enterprise Linux Server Optional (v. 7) bluez 5.44-7.el7, bluez-cups 5.44-7.el7, bluez-hid2hci 5.44-7.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) bluez 5.44-7.el7, bluez-libs 5.44-7.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) bluez-cups 5.44-7.el7, bluez-hid2hci 5.44-7.el7
    fixed: vendor fix “Disable Bluetooth. Instructions on disabling bluetooth in Red Hat Enterprise Linux are available at: https://access.redhat.com/solutions/2682931” RHSA-2020:4001
  • Red Hat Enterprise Linux 6 bluez, bluez-alsa, bluez-cups, bluez-libs, bluez-compat, bluez-gstreamer
    not affected: vulnerable code not present

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

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
NVD 2.0 5.8 AV:A/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Intel BlueZ

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.