CVE-2019-19194

Name: CVE-2019-19194
Creator: NVD / NIST
Published: 2020-02-12T15:15:12.053+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2019-19194 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.00%

58.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Telink-Semi	Tlsr8258 Ble Sdk	<= 3.4.0
Telink-Semi	Tlsr8269 Ble Sdk	<= 3.3
Telink-Semi	Tlsr8253 Ble Sdk	<= 3.4.0
Telink-Semi	Tlsr8251 Ble Sdk	<= 3.4.0
Telink-Semi	Tlsr8232 Ble Sdk	<= 1.3.0

References

http://www.telink-semi.com/bleVendor Advisory
https://asset-group.github.io/disclosures/sweyntooth/Exploit, Third Party Advisory
http://www.telink-semi.com/bleVendor Advisory
https://asset-group.github.io/disclosures/sweyntooth/Exploit, Third Party Advisory

Timeline

Published: Feb 12, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-19194?

How severe is CVE-2019-19194?

CVE-2019-19194 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2019-19194?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-19194?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST