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Legion Phone Pro \(l79031\)firmwareOperating system · Lenovo

CVE-2021-3720

MEDIUM · 5.5 CVSS v3.1 Published 2021-11-12
Fix available
A fix is available. Upgrade to 12.5.231 / 12.5.632 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An information disclosure vulnerability was reported in the Time Weather system widget on Legion Phone Pro (L79031) and Legion Phone2 Pro (L70081) that could allow other applications to access device GPS data.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

An information disclosure vulnerability in the Time Weather system widget on Legion Phone Pro (L79031) and Legion Phone2 Pro (L70081) allows other applications to access device GPS data without proper authorization, exposing user location information.

MitigationApply vendor firmware/security update to address improper GPS data access controls in the Weather widget; until then, revoke location permissions from untrusted third-party applications.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Legion Phone Pro \(l79031\)firmwareOperating system
Affected:< 12.5.231
Legion Phone2 Pro \(l70081\) FirmwareOperating system
Affected:< 12.5.632

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify your device model
    Go to Settings > About Phone > Model Number, or run `getprop ro.product.model` via ADB shell, to confirm if the device is Lenovo Legion Phone Pro (l79031) or Legion Phone2 Pro (l70081)
    Affected if The device model is not l79031 or l70081 (this CVE only affects these two specific models)
  2. Check installed firmware version
    Go to Settings > About Phone > Build Number, or run `getprop ro.build.version.release` via ADB shell, then compare against 12.5.231 for l79031 or 12.5.632 for l70081
    Affected if Firmware version is below 12.5.231 on Legion Phone Pro, or below 12.5.632 on Legion Phone2 Pro
  3. Verify Time Weather widget presence
    Check the device home screen widgets or app drawer for a Weather widget application; on Lenovo Legion devices this is typically a pre-installed system widget named 'Time Weather' or 'Weather'
    Affected if The Time Weather widget is present on the device (the vulnerability exists within this specific widget)
  4. Review location permissions granted to apps
    Go to Settings > Apps > Permissions > Location, or run `dumpsys package` via ADB to list apps with location permission; check if any untrusted third-party applications have location access
    Affected if Any third-party (non-system) applications have been granted location permissions, as the flaw allows unauthorized apps to access GPS through the Weather widget

Your device is affected if it is a Lenovo Legion Phone Pro (l79031) with firmware below 12.5.231, or a Legion Phone2 Pro (l70081) with firmware below 12.5.632, and the Time Weather widget is present with other apps having location permissions.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 12.5.231 / 12.5.632 or later
Fixed in 12.5.23112.5.632
Interim mitigation

Apply vendor firmware/security update to address improper GPS data access controls in the Weather widget; until then, revoke location permissions from untrusted third-party applications.

Recommended fix High confidence

Legion Phone Pro (L79031) firmware 12.5.231 or later; Legion Phone2 Pro (L70081) firmware 12.5.632 or later

  1. Check for system updates on your Legion Phone Pro (L79031) or Legion Phone2 Pro (L70081) device
  2. Ensure the device is connected to Wi-Fi and has sufficient battery (recommended to be charging)
  3. Navigate to Settings > System > System Update (or Settings > About Phone > System Update)
  4. Download and install the firmware update to version 12.5.231 or later for Legion Phone Pro (L79031), or version 12.5.632 or later for Legion Phone2 Pro (L70081)
  5. Restart the device if prompted to complete the installation

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Legion Phone Pro \(l79031\)firmware Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA3.0 h
27.0 hours of engineering $4,800
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-3720 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data