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A1 FirmwareOperating system · Lenovo

CVE-2021-42852

HIGH · 8.0 CVSS v3.1 Published 2022-05-18
Fix available
A fix is available. Upgrade to 5.3.6.t1 / 5.3.6.a1 or later.
See remediation →
82/100
Remediation priority · High
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
A command injection vulnerability was reported in some Lenovo Personal Cloud Storage devices that could allow an authenticated user to execute operating system commands by sending a crafted packet to the device.

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

A command injection vulnerability in Lenovo Personal Cloud Storage devices allows authenticated users to execute arbitrary OS commands via crafted network packets. This occurs due to insufficient input validation when processing network requests, enabling an attacker with valid credentials to break out of expected command contexts and execute system-level commands.

MitigationApply available vendor firmware updates for affected Lenovo Personal Cloud Storage devices. Until patched, limit device access to trusted authenticated users only and network segment these devices to reduce exposure.

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
A1 FirmwareOperating system
Affected:< 5.3.6.a1
T1 FirmwareOperating system
Affected:< 5.3.6.t1
X1 FirmwareOperating system
Affected:< 5.3.8.x1
T2 FirmwareOperating system
Affected:< 5.3.8.t2
T2pro FirmwareOperating system
Affected:< 5.3.7.t2-pro

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
Adjacent
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

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 the Lenovo Personal Cloud Storage model
    Access the device admin interface or check the device label to confirm the model is one of: A1, T1, X1, T2, or T2pro
    Affected if Device is any of these models and firmware version is not visible or is below the fixed versions
  2. Check installed firmware version
    Log into the device admin panel or use theLenovo mobile/desktop application to view the current firmware version under Settings or System Information
    Affected if Firmware version is below 5.3.6.a1 (A1), 5.3.6.t1 (T1), 5.3.8.x1 (X1), 5.3.8.t2 (T2), or 5.3.7.t2-pro (T2pro)
  3. Verify network accessibility of the management interface
    Attempt to ping the device IP or access its web interface from a remote location to confirm it is reachable on the network
    Affected if The device management interface is directly accessible from untrusted networks
  4. Confirm authentication method and credential status
    Review whether the device uses default credentials, shared accounts, or weak password policies for user access
    Affected if Default credentials are unchanged or the device permits authenticated access from untrusted network segments

The device is affected if it is a Lenovo Personal Cloud Storage model (A1, T1, X1, T2, or T2pro) running firmware below the fixed versions and the management interface is network-accessible to authenticated users.

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 5.3.6.t1 / 5.3.6.a1 / 5.3.7.t2-pro or later
Fixed in 5.3.6.t15.3.6.a15.3.7.t2-pro
Interim mitigation

Apply available vendor firmware updates for affected Lenovo Personal Cloud Storage devices. Until patched, limit device access to trusted authenticated users only and network segment these devices to reduce exposure.

Recommended fix High confidence

A1: 5.3.6.a1 | T1: 5.3.6.t1 | X1: 5.3.8.x1 | T2: 5.3.8.t2 | T2pro: 5.3.7.t2-pro

  1. 1. Identify the Lenovo Personal Cloud Storage device model (A1, T1, X1, T2, or T2pro)
  2. 2. Access the device administration interface or check current firmware version through the device settings
  3. 3. Download the appropriate firmware update from Lenovo's official support website (iknow.lenovo.com.cn)
  4. 4. Follow the device's standard firmware update procedure to apply the new firmware version
  5. 5. Verify the firmware upgrade was successful by confirming the new version matches the fixed release for your model

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

Fix this in A1 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,840
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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-2021-42852 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