What’s Vulnerable › Vulnerabilities

CVE-2019-19194

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-12 · updated 2026-06-17

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.

Affected products

• Telink-Semi Tlsr8232 Ble Sdk: through 1.3.0
• Telink-Semi Tlsr8251 Ble Sdk: through 3.4.0
• Telink-Semi Tlsr8253 Ble Sdk: through 3.4.0
• Telink-Semi Tlsr8258 Ble Sdk: through 3.4.0
• Telink-Semi Tlsr8269 Ble Sdk: through 3.3

References

• http://www.telink-semi.com/ble
• https://asset-group.github.io/disclosures/sweyntooth/
• http://www.telink-semi.com/ble
• https://asset-group.github.io/disclosures/sweyntooth/

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