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CVE-2020-24490· NVD / CVE Program· CNA intel

Improper buffer restrictions in BlueZ may allow an unauthenticated user to potentially enable denial of service via adjacent access.

Improper buffer restrictions in BlueZ may allow an unauthenticated user to potentially enable denial of service via adjacent access. This affects all Linux kernel versions that support BlueZ.

MediumCVSS 6.5 · v3.1—Proof of concept Fix available
Published
Feb 2, 2021
Updated
Jun 16, 2026
EPSS
2.2% · 82th percentile
CWE
—
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JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.2%

Affected systems

VendorProduct
bluezbluez
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • bluez bluezall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (intel). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a BlueZ Advisory

    • all Linux kernel versions that support BlueZaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.7.17-15.7.17-1
Debian:9linuxbefore 4.9.240-14.9.240-1
openSUSE:Leap 15.2kernel-debugbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-defaultbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-default-basebefore 5.3.18-lp152.50.1.lp152.8.10.15.3.18-lp152.50.1.lp152.8.10.1
openSUSE:Leap 15.2kernel-docsbefore 5.3.18-lp152.47.15.3.18-lp152.47.1
openSUSE:Leap 15.2kernel-kvmsmallbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-obs-buildbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-obs-qabefore 5.3.18-lp152.47.15.3.18-lp152.47.1
openSUSE:Leap 15.2kernel-preemptbefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-sourcebefore 5.3.18-lp152.47.25.3.18-lp152.47.2
openSUSE:Leap 15.2kernel-symsbefore 5.3.18-lp152.47.15.3.18-lp152.47.1
Red Hat:enterprise_linux:8::baseosbpftoolbefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseosbpftool-debuginfobefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernelbefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-abi-whitelistsbefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-corebefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-debugbefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-debug-corebefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-debug-debuginfobefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-debug-develbefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-debug-modulesbefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-debug-modules-extrabefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3
Red Hat:enterprise_linux:8::baseoskernel-debuginfobefore 0:4.18.0-240.1.1.el8_30:4.18.0-240.1.1.el8_3

+68

Other highest-scoring records for the same primary product.

  • CVE-2024-8805BlueZ HID over GATT Profile Improper Access Control Remote Code Execution Vulnerability
    36Monitor
  • CVE-2022-0204A heap overflow vulnerability was found in bluez in versions prior to 5.63.
    36Monitor
  • CVE-2021-43400An issue was discovered in gatt-database.c in BlueZ 5.61.
    36Monitor
  • CVE-2022-39177BlueZ before 5.59 allows physically proximate attackers to cause a denial of service because malformed and invalid capabilities can be proce
    35Monitor
  • CVE-2022-39176BlueZ before 5.59 allows physically proximate attackers to obtain sensitive information because profiles/audio/avrcp.c does not validate par
    35Monitor
  • CVE-2019-8922A heap-based buffer overflow was discovered in bluetoothd in BlueZ through 5.48.
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux5.7.17-1 · Debian:12Package registry (OSV)
opensuse:sca-patterns-base1.5.0-150300.10.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:sca-patterns-hae1.5.1-150300.10.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:sca-patterns-sle111.5.1-150300.18.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:sca-patterns-sle121.5.1-150300.3.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:sca-patterns-sle151.5.1-150300.14.3.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:bpftool0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-240.1.1.el8_3 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
suse:sca-patterns-base1.5.0-150300.10.3.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3Package registry (OSV)
suse:sca-patterns-hae1.5.1-150300.10.3.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3Package registry (OSV)
suse:sca-patterns-sle111.5.1-150300.18.3.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3Package registry (OSV)
suse:sca-patterns-sle121.5.1-150300.3.3.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3Package registry (OSV)
suse:sca-patterns-sle151.5.1-150300.14.3.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3Package registry (OSV)
suse:sca-patterns-suma1.5.0-150300.9.3.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3Package registry (OSV)
suse:sca-server-report1.5.1-150300.11.3.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02024-04-29
Proof-of-concept repository on GitHubstars:02024-04-29

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+1181 d
  3. TodaySep 30, 2026+2066 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records