What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-02-26 · updated 2026-06-17
• Weakness: CWE-703

Description

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

Affected products

• zephyrproject zephyr: 2.4.0, 2.4.0-rc1, 2.4.0-rc2, 2.4.0-rc3

References

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

Get alerted when CVE-2021-3329 or the next vulnerability affects your stack