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CVE-2019-19194: The Bluetooth Low Energy Secure Manager Protocol (SMP) implementation on Telink Semiconductor BLE SDK versions

52
This month
HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2019-19194 is a high-severity flaw (CVSS 8.8) affecting tlsr8258 ble sdk, tlsr8269 ble sdk, tlsr8253 ble sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorAdjacent network
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.0% (top 37%)
CISA exploited listNo
Published2020-02-12
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: telink-semi

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

telink-semi tlsr8258 ble sdk UPGRADE
Affected: <= 3.4.0
Fixed in: newer than 3.4.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy tlsr8258-ble-sdk || rpm -q tlsr8258-ble-sdk || tlsr8258-ble-sdk --version
2. UPGRADE to newer than 3.4.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade tlsr8258-ble-sdk
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade tlsr8258-ble-sdk
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
telink-semi tlsr8269 ble sdk UPGRADE
Affected: <= 3.3
Fixed in: newer than 3.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy tlsr8269-ble-sdk || rpm -q tlsr8269-ble-sdk || tlsr8269-ble-sdk --version
2. UPGRADE to newer than 3.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade tlsr8269-ble-sdk
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade tlsr8269-ble-sdk
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
telink-semi tlsr8253 ble sdk UPGRADE
Affected: <= 3.4.0
Fixed in: newer than 3.4.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy tlsr8253-ble-sdk || rpm -q tlsr8253-ble-sdk || tlsr8253-ble-sdk --version
2. UPGRADE to newer than 3.4.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade tlsr8253-ble-sdk
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade tlsr8253-ble-sdk
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
telink-semi tlsr8251 ble sdk UPGRADE
Affected: <= 3.4.0
Fixed in: newer than 3.4.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy tlsr8251-ble-sdk || rpm -q tlsr8251-ble-sdk || tlsr8251-ble-sdk --version
2. UPGRADE to newer than 3.4.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade tlsr8251-ble-sdk
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade tlsr8251-ble-sdk
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
telink-semi tlsr8232 ble sdk UPGRADE
Affected: <= 1.3.0
Fixed in: newer than 1.3.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy tlsr8232-ble-sdk || rpm -q tlsr8232-ble-sdk || tlsr8232-ble-sdk --version
2. UPGRADE to newer than 1.3.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade tlsr8232-ble-sdk
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade tlsr8232-ble-sdk
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-19194?

tlsr8258 ble sdk: upgrade to newer than 3.4.0; tlsr8269 ble sdk: upgrade to newer than 3.3; tlsr8253 ble sdk: upgrade to newer than 3.4.0. Exact commands for each OS are on this page.

Is CVE-2019-19194 being exploited?

CVE-2019-19194 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-19194 affect?

CVE-2019-19194 affects tlsr8258 ble sdk, tlsr8269 ble sdk, tlsr8253 ble sdk. Severity is high (CVSS 8.8). 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 te

How urgent is CVE-2019-19194?

Priority 52/100. High severity; Public exploit reference

Software pages

Bluetooth vulnerabilities

Related CVEs

References

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