Security readout for executives and security teams
Plain-English summary
CVE-2021-42852 affects several Lenovo Personal Cloud Storage devices. An authenticated user on an adjacent network could make the device run operating system commands through a crafted packet. That can compromise confidentiality, integrity, and availability. The bundle does not show active exploitation or confirmed patch details.
Executive priority
Prioritize this as high where affected devices remain in service. The main business risk is compromise of a storage appliance, potentially exposing or altering stored data and disrupting availability. Urgency depends on whether these legacy devices are present and reachable.
Technical view
This is CWE-78 command injection with CVSS 3.1 score 8.0. The vector is AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, meaning adjacent-network access and low privileges are required, with no user interaction. Affected products are Lenovo Personal Cloud Storage A1, T1, X1, T2, and T2Pro; versions are unspecified.
Likely exposure
Likely exposure is limited to environments still using the named Lenovo Personal Cloud Storage models where authenticated users can reach device services from the local or adjacent network. Internet-wide exposure is not supported by the supplied CVSS vector.
Exploitation context
The source bundle does not list CISA KEV status and provides no evidence of public exploitation. The vulnerability is still serious because low-privileged authenticated access can lead to operating system command execution on the storage device.
Researcher notes
Evidence is sparse: affected versions are unspecified and the supplied bundle does not include remediation details. Validation should focus on asset confirmation, firmware/support status, and reachability. Do not assume internet exploitation or a universal patch beyond Lenovo guidance.
Mitigation direction
- Review Lenovo's advisory for model-specific fixed firmware or retirement guidance.
- Inventory Lenovo Personal Cloud Storage A1, T1, X1, T2, and T2Pro devices.
- Limit device access to trusted administrative networks and users.
- Remove or replace affected devices if no supported vendor fix exists.
Validation and detection
- Confirm whether any listed Lenovo Personal Cloud Storage models are deployed.
- Record firmware version, support status, and Lenovo advisory applicability.
- Verify administrative access is limited to trusted users and network segments.
- Check logs for unexpected authenticated access to affected 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.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-42852 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
- High
- CVSS
- 8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://iknow.lenovo.com.cn/detail/dc_200017.htmlCVE 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.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.