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A1 FirmwareOperating system · Lenovo

CVE-2021-42850

HIGH · 7.8 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 →
80/100
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 weak default administrator password for the web interface and serial port was reported in some Lenovo Personal Cloud Storage devices that could allow unauthorized device access to an attacker with physical or local network access.

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 · high confidence

Lenovo Personal Cloud Storage devices contain a weak default administrator password for both the web management interface and serial console. An attacker with physical access to the device or position on the local network can exploit this to gain full administrative access.

MitigationChange the default administrator password immediately on all affected devices via the web interface and serial console. Restrict network access to the management interfaces and consider disabling the serial port if not required.

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

CVSS:3.1/AV:L/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 device model
    Locate the model label on the device or access the web management interface to confirm the model number. Affected models are: Lenovo A1, T1, X1, T2, and T2pro.
    Affected if The device is one of these five models.
  2. Check the installed firmware version
    Access the device web management interface, usually via browser at the device IP address, and navigate to System Settings or About page to view the firmware version. Alternatively, access via serial console and run the command to display firmware version (often 'version' or 'fwver').
    Affected if The firmware version is below: A1 < 5.3.6.a1, T1 < 5.3.6.t1, X1 < 5.3.8.x1, T2 < 5.3.8.t2, or T2pro < 5.3.7.t2-pro.
  3. Verify if default administrator password is still in use
    Attempt to log into the web management interface using the default administrator credentials. The default username is typically 'admin'. If login succeeds without password change since initial setup, the default weak password is active.
    Affected if The default administrator password has not been changed from the factory default.
  4. Confirm serial console access status
    If physically accessible, connect to the device serial console and attempt login using default credentials. Check if serial console is enabled and uses the same weak default password.
    Affected if Serial console is accessible with default administrator credentials.

The device is affected if it is a Lenovo A1, T1, X1, T2, or T2pro model running firmware below the fixed versions AND the default administrator password has not been changed.

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

Change the default administrator password immediately on all affected devices via the web interface and serial console. Restrict network access to the management interfaces and consider disabling the serial port if not required.

Recommended fix High confidence

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

  1. Identify the specific Lenovo Personal Cloud Storage model (A1, T1, X1, T2, or T2pro) in use
  2. Access the device administration interface or check current firmware version
  3. Download the appropriate firmware update from Lenovo's support site (iknow.lenovo.com.cn)
  4. Follow Lenovo's standard firmware update procedure to apply the update
  5. After updating, verify the new firmware version is installed
  6. Change the default administrator password to a strong, unique password if not automatically prompted

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

Fix this in A1 Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
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Scan for this in your stack

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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-2021-42850 in production — separate from our analysis above.

No notes yet

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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