Security readout for executives and security teams
Plain-English summary
This CVE describes a physical-channel weakness in the gyroscope of Xiaomi Mi 5s devices. A 20.4 kHz audio signal can reportedly disrupt sensor readings or cause denial of service through resonance. Business urgency is limited unless these phones are used in workflows that trust motion or orientation data.
Executive priority
Low operational priority for most organizations, but review quickly if affected phones support safety, navigation, authentication, evidence collection, or other sensor-trust workflows. Treat this as a niche hardware exposure rather than an enterprise-wide software emergency.
Technical view
The issue is described as a MEMS ultrasound attack against the gyroscope, causing resonance and false data. The CVE record provides no CVSS score, CWE, patch status, or detailed affected-version matrix. Public references are limited and should be treated as supporting research context, not complete vendor remediation guidance.
Likely exposure
Exposure appears limited to environments using Xiaomi Mi 5s devices, with possible ambiguity from a reference mentioning Mi 5s Plus. Risk requires proximity to a 20.4 kHz audio signal and reliance on gyroscope output. General server, cloud, and web application assets are not implicated by the supplied sources.
Exploitation context
The source bundle does not show active exploitation, and KEV status is false. The described attack requires a physical acoustic condition, not remote network access. Evidence supports sensor disruption risk, but not widespread exploitation, malware use, or a confirmed vendor fix.
Researcher notes
The source data is sparse: no CVSS, CWE, CPE, or vendor fix is provided. The CVE description names Xiaomi Mi 5s, while one reference title mentions Mi5s Plus. Validate exact models before scoping remediation or testing.
Mitigation direction
- Inventory Xiaomi Mi 5s devices used in business operations.
- Check Xiaomi or device vendor guidance for firmware or replacement advice.
- Avoid relying on affected gyroscope data for safety or security decisions.
- Limit exposure to untrusted ultrasonic audio in sensitive environments.
- Retire affected devices from high-assurance workflows if no fix exists.
Validation and detection
- Confirm whether any Xiaomi Mi 5s devices are still deployed.
- Identify applications that depend on trusted gyroscope readings.
- Review vendor guidance and the cited public references.
- Document whether affected devices operate near controllable audio sources.
- Record compensating controls for any retained devices.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-20823 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://medium.com/%40juliodellaflora/ultrassom-pode-causar-anomalias-no-girosc%C3%B3pio-do-xiaomi-mi5s-plus-4050d718bc7fCVE reference · x_refsource_MISC
- https://hackaday.com/2018/07/17/freak-out-your-smartphone-with-ultrasound/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.