Memory disclosure and crash via unchecked HCI responses
Published Jan 19, 2023 · Updated Apr 3, 2025
Buffer over-read in Zephyr RTOS 3.2 and earlier allows physically proximate attackers to disclose memory or crash a device. Most callers of bt_hci_cmd_send_sync cast response-buffer data to expected structures without first checking that enough bytes remain. Exploitation requires a malicious or defective Bluetooth controller to return a truncated HCI command response; consequences are limited to information exposure and device denial of service.
Summary
What happened
Buffer over-read in Zephyr RTOS 3.2 and earlier allows physically proximate attackers to disclose memory or crash a device. Most callers of bt_hci_cmd_send_sync cast response-buffer data to expected structures without first checking that enough bytes remain. Exploitation requires a malicious or defective Bluetooth controller to return a truncated HCI command response; consequences are limited to information exposure and device denial of service.
The record
- CVE
- CVE-2023-0396
- Published
- Jan 19, 2023
- Updated
- Apr 3, 2025
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-125, CWE-126, T1499
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 19, 2023CVE publishedPublication date reported by the CVE source.
- Apr 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <=v3.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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