// For flags

CVE-2021-3329

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

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
High
Attack Vector
Adjacent
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-01-27 CVE Reserved
  • 2023-02-26 CVE Published
  • 2025-03-11 CVE Updated
  • 2025-03-11 First Exploit
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-665: Improper Initialization
  • CWE-703: Improper Check or Handling of Exceptional Conditions
CAPEC
References (1)
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Zephyrproject
Search vendor "Zephyrproject"
Zephyr
Search vendor "Zephyrproject" for product "Zephyr"
2.4.0
Search vendor "Zephyrproject" for product "Zephyr" and version "2.4.0"
-
Affected
Zephyrproject
Search vendor "Zephyrproject"
Zephyr
Search vendor "Zephyrproject" for product "Zephyr"
2.4.0
Search vendor "Zephyrproject" for product "Zephyr" and version "2.4.0"
rc1
Affected
Zephyrproject
Search vendor "Zephyrproject"
Zephyr
Search vendor "Zephyrproject" for product "Zephyr"
2.4.0
Search vendor "Zephyrproject" for product "Zephyr" and version "2.4.0"
rc2
Affected
Zephyrproject
Search vendor "Zephyrproject"
Zephyr
Search vendor "Zephyrproject" for product "Zephyr"
2.4.0
Search vendor "Zephyrproject" for product "Zephyr" and version "2.4.0"
rc3
Affected