CVE-2021-3329

DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer

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Published Feb 26, 2023 CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed

Description

Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

zephyrproject-rtos

zephyr

affected

Version	Status	Constraints
`unspecified`	affected	≤ v2.4

Configuration 1 [-]

OR	cpe:2.3:o:zephyrproject:zephyr:2.4.0:-::::::
	cpe:2.3:o:zephyrproject:zephyr:2.4.0:rc1::::::
	cpe:2.3:o:zephyrproject:zephyr:2.4.0:rc2::::::
	cpe:2.3:o:zephyrproject:zephyr:2.4.0:rc3::::::

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source	ID	Title
EUVD	EUVD-2021-26660	Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack

Metrics

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.616% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117

History

Mar 11, 2025 4:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Subscriptions

Zephyrproject Zephyr

Weaknesses

Sources

CVE record Updated: Mar 11, 2025, 3:25 PM

Status: PUBLISHED
Assigner: zephyr
Published: Feb 26, 2023, 12:00 AM
Updated: Mar 11, 2025, 3:25 PM
Reserved: Jan 27, 2021, 12:00 AM

View source JSON

Vulnrichment Updated: Aug 3, 2024, 4:53 PM

Updated: Aug 3, 2024, 4:53 PM

NVD Updated: Jun 17, 2026, 4:04 AM

Status: Modified
Published: Feb 26, 2023, 7:15 AM
Modified: Jun 17, 2026, 4:04 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

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