Vulnerability Intelligence Report
DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer
CVE-2021-3329
Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack
No Active Exploit Signals
CVSS Base Score
9.6
CRITICAL
Exploitability:2.9
Impact Score:6.0
EPSS Probability:0.62%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-703 ↗Improper Check or Handling of Exceptional Conditions (CWE-703)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| zephyrproject-rtos | zephyr | unspecified <= v2.4 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.616%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Zephyr Project · Vendor · USA |
| Reserved | 2021-01-27T00:00:00 |
| Published | 2023-02-26T00:00:00 |
| Patch Date | 2023-02-25 |
| Last Updated | 2025-03-11T15:25:38 |
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