Memory corruption via oversized encrypted ATT write
Published Sep 11, 2026 · Updated Sep 11, 2026
Out-of-bounds write in ArduinoBLE before 2.0.2 allows remote attackers to corrupt device memory via a malformed Bluetooth ATT write request. The ATT write handler copies queued request data into ATTClass::writeBuffer without confirming that it fits the fixed 64-byte buffer. Reachability requires an unauthenticated BLE client and at least one characteristic configured with BLEEncryption; overwritten bytes reside in the global ATTClass object.
Summary
What happened
Out-of-bounds write in ArduinoBLE before 2.0.2 allows remote attackers to corrupt device memory via a malformed Bluetooth ATT write request. The ATT write handler copies queued request data into ATTClass::writeBuffer without confirming that it fits the fixed 64-byte buffer. Reachability requires an unauthenticated BLE client and at least one characteristic configured with BLEEncryption; overwritten bytes reside in the global ATTClass object.
The record
- CVE
- CVE-2026-47773
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- Arduino
- Product
- ArduinoBLE
- Classifications
- Unavailable
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 2026Record 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=< 2.0.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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
No sourced classifications are available.
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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