Security readout for executives and security teams
Plain-English summary
Some Lenovo Personal Cloud Storage devices reportedly used a weak default password on the serial port. An attacker would need physical access to the device, but successful access could compromise confidentiality, integrity, and availability of the stored system.
Executive priority
Treat as a moderate priority physical-access risk. It is not presented as remotely exploitable or actively exploited, but compromise could be severe if devices hold sensitive data or are accessible in offices, labs, warehouses, or repair channels.
Technical view
CVE-2021-42849 is a CWE-798 weak default credential issue affecting Lenovo Personal Cloud Storage A1, T1, X1, T2, and T2Pro. The CVSS 3.1 score is 6.8 with physical attack vector and high CIA impact. Source data does not specify fixed versions.
Likely exposure
Exposure is limited to organizations that still possess affected Lenovo Personal Cloud Storage models and allow physical access to them. Remote internet exposure is not supported by the cited CVE data.
Exploitation context
The CVE requires physical access and no privileges or user interaction. CISA KEV is false in the bundle, and no cited source confirms active exploitation.
Researcher notes
The public bundle identifies the weakness and affected product names but does not provide detailed version ranges, firmware identifiers, or patch status. Avoid assuming broader Lenovo NAS or cloud-storage impact without vendor confirmation.
Mitigation direction
- Inventory affected Lenovo Personal Cloud Storage models.
- Check Lenovo advisory for model-specific guidance and updates.
- Restrict physical access to deployed and stored devices.
- Retire or isolate unsupported devices where vendor guidance is unavailable.
- Review device disposal and repair-handling controls.
Validation and detection
- Confirm whether A1, T1, X1, T2, or T2Pro units exist.
- Verify physical access controls around affected devices.
- Review Lenovo advisory for affected scope and remediation details.
- Check asset records for retired or stored devices.
- Document unresolved devices and compensating controls.
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-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-42849 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
- Medium
- CVSS
- 6.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:P/AC:L/PR:N/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:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.8MediumVector: CVSS:3.1/AV:P/AC:L/PR:N/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.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.