CVE-2021-3329: DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer

Medium severity · published Feb 26, 2023

CVE-2021-3329

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

6.5

CVSS

0.6%

EPSS

On KEV

Description

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

CVSS vector

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

Attack vector

Adjacent

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.6% · higher than 49% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

zephyr · zephyrproject-rtos

through v2.4 · source: vendor, NVD

Affected product

zephyr

zephyrproject-rtos

All zephyr CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-3329

CVE.org

https://www.cve.org/CVERecord?id=CVE-2021-3329

Exploit

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