CVE-2023-2234
BT HCI host union variant confusion
Union variant confusion allows any malicious BT controller to execute arbitrary code on the Zephyr host.
Attack profile
How easy it is to exploit
- Attack vector
- Physical
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
BT HCI host union variant confusion
Union variant confusion allows any malicious BT controller to execute arbitrary code on the Zephyr host.
- Record
CVE-2023-2234- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-843
- Updated
- 2026-11-02
EUVDEUVD-2023-33744
Union variant confusion allows any malicious BT controller to execute arbitrary code on the Zephyr host.
- Record
EUVD-2023-33744- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
NVD
Union variant confusion allows any malicious BT controller to execute arbitrary code on the Zephyr host.
- Record
CVE-2023-2234- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-843
- Updated
- 2026-11-02
OSVCVE-2023-1902
HCI Connection Creation Dangling State Reference Re-use
The bluetooth HCI host layer logic not clearing a global reference to a state pointer after handling connection events may allow a malicious HCI Controller to cause the use of a dangling reference in the host layer, leading to a crash (DoS) or potential RCE on the Host layer.
- Record
CVE-2023-1902- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H - Updated
- 2026-11-02
OSV
BT HCI host union variant confusion
Union variant confusion allows any malicious BT controller to execute arbitrary code on the Zephyr host.
- Record
CVE-2023-2234- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-843
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-2234 is a medium vulnerability (CVSS 6.8) in Zephyrproject Zephyr, published July 10, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 42nd percentile. No source names a fixed version.
References
github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fx9g-8fr2-q899
nvd.nist.gov/vuln/detail/CVE-2023-1902