High severity8.8NVD Advisory· Published Feb 12, 2020· Updated Jun 17, 2026
CVE-2019-19194
CVE-2019-19194
Description
The Bluetooth Low Energy Secure Manager Protocol (SMP) implementation on Telink Semiconductor BLE SDK versions before November 2019 for TLSR8x5x through 3.4.0, TLSR823x through 1.3.0, and TLSR826x through 3.3 devices installs a zero long term key (LTK) if an out-of-order link-layer encryption request is received during Secure Connections pairing. An attacker in radio range can have arbitrary read/write access to protected GATT service data, cause a device crash, or possibly control a device's function by establishing an encrypted session with the zero LTK.
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Affected products
8- Telink Semiconductor/BLE SDKdescription
- Range: < November 2019 for TLSR8x5x through 3.4.0, < 1.3.0 for TLSR823x, < 3.3 for TLSR826x
- Range: < November 2019 through 3.4.0
Patches
Vulnerability mechanics
References
2- asset-group.github.io/disclosures/sweyntooth/nvdExploitThird Party Advisory
- www.telink-semi.com/blenvdVendor Advisory
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