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CVE-2020-0556

Improper access control in subsystem for BlueZ before version 5.53 may allow an unauthenticated...

7.1 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector
Adjacent network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

1.04%Down 1.0 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.1

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

Record
CVE-2020-0556
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
CVSS 2.0
5.8 MediumAV:A/AC:L/Au:N/C:P/I:P/A:P
Updated
2026-11-02
CVE List No score

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

Record
CVE-2020-0556
Updated
2026-11-02
EUVDEUVD-2020-2054 No score

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

Record
EUVD-2020-2054
Updated
2026-11-03
GitHub AdvisoriesGHSA-xjj6-3w9q-h5xv 7.1

Improper access control in subsystem for BlueZ before version 5.53 may allow an unauthenticated...

Improper access control in subsystem for BlueZ before version 5.53 may allow an unauthenticated user to potentially enable escalation of privilege and denial of service via adjacent access.

Record
GHSA-xjj6-3w9q-h5xv
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-269
Updated
2026-11-02
OSVALPINE-CVE-2020-0556 7.1

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

Record
ALPINE-CVE-2020-0556
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-03
OSVBELL-CVE-2020-0556 7.1

CVE-2020-0556 does not affect BellSoft software

Record
BELL-CVE-2020-0556
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
Show 13 moreShow less
OSV 7.1

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

Record
CVE-2020-0556
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2020-0556 7.1

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

Record
DEBIAN-CVE-2020-0556
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVRHSA-2020:4001 7.1

Red Hat Security Advisory: bluez security update

Record
RHSA-2020:4001
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVRHSA-2020:4481 7.1

Red Hat Security Advisory: bluez security update

Record
RHSA-2020:4481
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2020-0556 7.1

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

Record
UBUNTU-CVE-2020-0556
CVSS 3.1
7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVMGASA-2020-0152 No score

Updated bluez packages fix security vulnerabilities

The updated packages fix security vulnerabilities:

A bug in Bluez may allow for the Bluetooth Discoverable state being set to on when no Bluetooth agent is registered with the system. This situation could lead to the unauthorized pairing of certain Bluetooth devices without any form of authentication. Versions before bluez 5.51 are vulnerable. (CVE-2018-10910)

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. (CVE-2020-0556)

Record
MGASA-2020-0152
Updated
2026-11-02
OSVopenSUSE-SU-2020:0479-1 No score

Security update for bluez

This update for bluez fixes the following issues:

  • CVE-2020-0556: Fixed an improper access control which could have allowed an unauthenticated user to potentially enable escalation of privilege and denial of service (bsc#1166751).

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2020:0479-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:0872-1 No score

Security update for bluez

This update for bluez fixes the following issues:

  • CVE-2020-0556: Fixed an improper access control which could have allowed an unauthenticated user to potentially enable escalation of privilege and denial of service (bsc#1166751).

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2020:0872-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10657-1 No score

bluez-5.61-1.5 on GA media

These are all security issues fixed in the bluez-5.61-1.5 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10657-1
Updated
2026-11-02
OSVSUSE-SU-2020:0918-1 No score

Security update for bluez

This update for bluez fixes the following issues:

  • CVE-2020-0556: Fixed an improper access control which could have allowed an unauthenticated user to potentially enable escalation of privilege and denial of service (bsc#1166751).
Record
SUSE-SU-2020:0918-1
Updated
2026-11-02
OSVSUSE-SU-2020:3034-1 No score

Security update for bluez

This update for bluez fixes the following issues:

  • CVE-2020-27153: Fixed crash on disconnect (bsc#1177895).
  • CVE-2020-0556: Fixed potential escalation of privilege and denial of service via adjacent access, caused by improper access control (bsc#1166751).
Record
SUSE-SU-2020:3034-1
Updated
2026-11-02
OSVSUSE-SU-2020:3516-1 No score

Security update for bluez

This update for bluez fixes the following issues:

  • CVE-2020-0556: Fixed improper access control which may lead to escalation of privilege and denial of service by an unauthenticated user (bsc#1166751).
Record
SUSE-SU-2020:3516-1
Updated
2026-11-02
OSVUSN-4311-1 No score

bluez vulnerabilities

It was discovered that BlueZ incorrectly handled bonding HID and HOGP devices. A local attacker could possibly use this issue to impersonate non-bonded devices. (CVE-2020-0556)

It was discovered that BlueZ incorrectly handled certain commands. A local attacker could use this issue to cause BlueZ to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7837)

Record
USN-4311-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
bluez
Alpine:v3.10
before 5.50-r4
5.50-r4
bluez
Alpine:v3.11
before 5.52-r1
5.52-r1
bluez
Alpine:v3.12
before 5.54-r0
5.54-r0
bluez
Alpine:v3.13
before 5.54-r0
5.54-r0
bluez
Alpine:v3.14
before 5.54-r0
5.54-r0
bluez
Alpine:v3.15
before 5.54-r0
5.54-r0
bluez
Alpine:v3.16
before 5.54-r0
5.54-r0
bluez
Alpine:v3.17
before 5.54-r0
5.54-r0
bluez
Alpine:v3.18
before 5.54-r0
5.54-r0
bluez
Alpine:v3.19
before 5.54-r0
5.54-r0
Show 99 moreShow less
Affected packages
PackageAffectedFixed
bluez
Alpine:v3.20
before 5.54-r0
5.54-r0
bluez
Alpine:v3.21
before 5.54-r0
5.54-r0
bluez
Alpine:v3.22
before 5.54-r0
5.54-r0
bluez
Alpine:v3.23
before 5.54-r0
5.54-r0
bluez
Alpine:v3.24
before 5.54-r0
5.54-r0
bluez
Alpine:v3.8
before 5.49-r3
5.49-r3
bluez
Alpine:v3.9
before 5.50-r1
5.50-r1
obexd-enhanced
Alpine:v3.19
before 5.54-r0
5.54-r0
obexd-enhanced
Alpine:v3.20
before 5.54-r0
5.54-r0
obexd-enhanced
Alpine:v3.21
before 5.54-r0
5.54-r0
obexd-enhanced
Alpine:v3.22
before 5.54-r0
5.54-r0
obexd-enhanced
Alpine:v3.23
before 5.54-r0
5.54-r0
obexd-enhanced
Alpine:v3.24
before 5.54-r0
5.54-r0
bluez
Debian:12
before 5.50-1.1
5.50-1.1
bluez
Debian:13
before 5.50-1.1
5.50-1.1
bluez
Debian:14
before 5.50-1.1
5.50-1.1
bluez
Debian:8
before 5.43-2+deb9u2~deb8u1, plus listed versions
5.23-25.23-2+deb8u15.33-15.36-15.40-1~exp05.41-15.43-15.43-2
5.43-2+deb9u2~deb8u1
bluez
Debian:9
before 5.43-2+deb9u2, plus listed versions
5.43-25.43-2+deb9u15.43-2+deb9u2~deb8u1
5.43-2+deb9u2
bluez
Debian:10
before 5.50-1.2~deb10u1, plus listed versions
5.50-15.50-1.1
5.50-1.2~deb10u1
bluez
Mageia:7
From an advisory covering 2 CVEs
before 5.54-1.mga7
5.54-1.mga7
bluez
Red Hat:enterprise_linux:7::client
before 0:5.44-7.el7
0:5.44-7.el7
bluez-debuginfo
Red Hat:enterprise_linux:7::client
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs
Red Hat:enterprise_linux:7::client
before 0:5.44-7.el7
0:5.44-7.el7
bluez-cups
Red Hat:enterprise_linux:7::client
before 0:5.44-7.el7
0:5.44-7.el7
bluez-hid2hci
Red Hat:enterprise_linux:7::client
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs-devel
Red Hat:enterprise_linux:7::client
before 0:5.44-7.el7
0:5.44-7.el7
bluez
Red Hat:enterprise_linux:7::computenode
before 0:5.44-7.el7
0:5.44-7.el7
bluez-debuginfo
Red Hat:enterprise_linux:7::computenode
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs
Red Hat:enterprise_linux:7::computenode
before 0:5.44-7.el7
0:5.44-7.el7
bluez-cups
Red Hat:enterprise_linux:7::computenode
before 0:5.44-7.el7
0:5.44-7.el7
bluez-hid2hci
Red Hat:enterprise_linux:7::computenode
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs-devel
Red Hat:enterprise_linux:7::computenode
before 0:5.44-7.el7
0:5.44-7.el7
bluez
Red Hat:enterprise_linux:7::server
before 0:5.44-7.el7
0:5.44-7.el7
bluez-debuginfo
Red Hat:enterprise_linux:7::server
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs
Red Hat:enterprise_linux:7::server
before 0:5.44-7.el7
0:5.44-7.el7
bluez-cups
Red Hat:enterprise_linux:7::server
before 0:5.44-7.el7
0:5.44-7.el7
bluez-hid2hci
Red Hat:enterprise_linux:7::server
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs-devel
Red Hat:enterprise_linux:7::server
before 0:5.44-7.el7
0:5.44-7.el7
bluez
Red Hat:enterprise_linux:7::workstation
before 0:5.44-7.el7
0:5.44-7.el7
bluez-debuginfo
Red Hat:enterprise_linux:7::workstation
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs
Red Hat:enterprise_linux:7::workstation
before 0:5.44-7.el7
0:5.44-7.el7
bluez-cups
Red Hat:enterprise_linux:7::workstation
before 0:5.44-7.el7
0:5.44-7.el7
bluez-hid2hci
Red Hat:enterprise_linux:7::workstation
before 0:5.44-7.el7
0:5.44-7.el7
bluez-libs-devel
Red Hat:enterprise_linux:7::workstation
before 0:5.44-7.el7
0:5.44-7.el7
bluez-cups
Red Hat:enterprise_linux:8::appstream
before 0:5.50-4.el8
0:5.50-4.el8
bluez-cups-debuginfo
Red Hat:enterprise_linux:8::appstream
before 0:5.50-4.el8
0:5.50-4.el8
bluez-debuginfo
Red Hat:enterprise_linux:8::appstream
before 0:5.50-4.el8
0:5.50-4.el8
bluez-debugsource
Red Hat:enterprise_linux:8::appstream
before 0:5.50-4.el8
0:5.50-4.el8
bluez-hid2hci-debuginfo
Red Hat:enterprise_linux:8::appstream
before 0:5.50-4.el8
0:5.50-4.el8
bluez-libs-debuginfo
Red Hat:enterprise_linux:8::appstream
before 0:5.50-4.el8
0:5.50-4.el8
bluez-obexd-debuginfo
Red Hat:enterprise_linux:8::appstream
before 0:5.50-4.el8
0:5.50-4.el8
bluez
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-cups-debuginfo
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-debuginfo
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-debugsource
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-hid2hci
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-hid2hci-debuginfo
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-libs
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-libs-debuginfo
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-obexd
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-obexd-debuginfo
Red Hat:enterprise_linux:8::baseos
before 0:5.50-4.el8
0:5.50-4.el8
bluez-cups-debuginfo
Red Hat:enterprise_linux:8::crb
before 0:5.50-4.el8
0:5.50-4.el8
bluez-debuginfo
Red Hat:enterprise_linux:8::crb
before 0:5.50-4.el8
0:5.50-4.el8
bluez-debugsource
Red Hat:enterprise_linux:8::crb
before 0:5.50-4.el8
0:5.50-4.el8
bluez-hid2hci-debuginfo
Red Hat:enterprise_linux:8::crb
before 0:5.50-4.el8
0:5.50-4.el8
bluez-libs-debuginfo
Red Hat:enterprise_linux:8::crb
before 0:5.50-4.el8
0:5.50-4.el8
bluez-libs-devel
Red Hat:enterprise_linux:8::crb
before 0:5.50-4.el8
0:5.50-4.el8
bluez-obexd-debuginfo
Red Hat:enterprise_linux:8::crb
before 0:5.50-4.el8
0:5.50-4.el8
bluez
SUSE:Linux Enterprise Module for Basesystem 15 SP1
before 5.48-5.25.1
5.48-5.25.1
bluez
SUSE:Linux Enterprise Module for Desktop Applications 15 SP1
before 5.48-5.25.1
5.48-5.25.1
bluez
SUSE:Linux Enterprise Workstation Extension 15 SP1
before 5.48-5.25.1
5.48-5.25.1
bluez
SUSE:Linux Enterprise Module for Basesystem 15 SP2
From an advisory covering 2 CVEs
before 5.48-13.3.1
5.48-13.3.1
bluez
SUSE:Linux Enterprise Module for Desktop Applications 15 SP2
From an advisory covering 2 CVEs
before 5.48-13.3.1
5.48-13.3.1
bluez
SUSE:Linux Enterprise Workstation Extension 15 SP2
From an advisory covering 2 CVEs
before 5.48-13.3.1
5.48-13.3.1
bluez
SUSE:HPE Helion OpenStack 8
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:OpenStack Cloud 7
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:OpenStack Cloud 8
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:OpenStack Cloud 9
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:OpenStack Cloud Crowbar 8
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:OpenStack Cloud Crowbar 9
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server for SAP Applications 12 SP2
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server for SAP Applications 12 SP3
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Software Development Kit 12 SP5
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server 12 SP2-LTSS
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server 12 SP2-BCL
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server 12 SP3-LTSS
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server 12 SP3-BCL
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server 12 SP4-LTSS
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server 12 SP5
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Linux Enterprise Workstation Extension 12 SP5
before 5.13-5.23.1
5.13-5.23.1
bluez
SUSE:Enterprise Storage 5
before 5.13-5.23.1
5.13-5.23.1
bluez
Ubuntu:16.04:LTS
before 5.37-0ubuntu5.3, plus listed versions
5.35-0ubuntu25.36-0ubuntu15.37-0ubuntu55.37-0ubuntu5.1
5.37-0ubuntu5.3
bluez
Ubuntu:18.04:LTS
before 5.48-0ubuntu3.4, plus listed versions
5.46-0ubuntu35.46-0ubuntu45.48-0ubuntu35.48-0ubuntu3.15.48-0ubuntu3.25.48-0ubuntu3.3
5.48-0ubuntu3.4
bluez
Ubuntu:16.04:LTS
From an advisory covering 2 CVEs
before 5.37-0ubuntu5.3, plus listed versions
5.35-0ubuntu25.36-0ubuntu15.37-0ubuntu55.37-0ubuntu5.1
5.37-0ubuntu5.3
bluez
Ubuntu:18.04:LTS
From an advisory covering 2 CVEs
before 5.48-0ubuntu3.4, plus listed versions
5.46-0ubuntu35.46-0ubuntu45.48-0ubuntu35.48-0ubuntu3.15.48-0ubuntu3.25.48-0ubuntu3.3
5.48-0ubuntu3.4
bluez
openSUSE:Leap 15.1
before 5.48-lp151.8.12.1
5.48-lp151.8.12.1
bluez
openSUSE:Leap 15.2
before 5.48-lp152.12.3.1
5.48-lp152.12.3.1

History

History
RecordedChangedSources
affected, facts
affectedOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-0556 is a high vulnerability (CVSS 7.1) in Bluez, published March 12, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.04%, the 64th percentile. Fixed in bluez 5.50-r4.

References

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