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CVE-2021-3329

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

MEDIUM
6.5
CVSS Score
Published: February 26, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 04:04 AM UTC
2 products affected across 2 vendorsZephyrZephyr

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

ExploitIssue TrackingVendor Advisory
Source: [email protected]
https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-703CWE-665

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