Missing authorization in Lenovo Personal Cloud Storage A1
Priority LOW 29CWE-862Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
A vulnerability was reported in some Lenovo Personal Cloud Storage devices that could allow an unauthenticated user to create a standard user account.
Why it matters now
EPSS 0.00596 48th percentileScored 2026-11-07
Fix Fixed Personal Cloud Storage A1 (Lenovo): 5.3.6.a1Personal Cloud Storage T1 (Lenovo): 5.3.6.t1+3 more products
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Lenovo | Personal Cloud Storage A1 | before 5.3.6.a1 | 5.3.6.a1 | Patch available | CNA |
| Lenovo | Personal Cloud Storage T1 | before 5.3.6.t1 | 5.3.6.t1 | Patch available | CNA |
| Lenovo | Personal Cloud Storage X1 | before 5.3.8.x1 | 5.3.8.x1 | Patch available | CNA |
| Lenovo | Personal Cloud Storage T2 | before 5.3.8.t2 | 5.3.8.t2 | Patch available | CNA |
| Lenovo | Personal Cloud Storage T2Pro | before 5.3.7.t2-pro | 5.3.7.t2-pro | Patch available | CNA |
- Personal Cloud Storage A1 VendorLenovo Affected before 5.3.6.a1 Fixed in 5.3.6.a1 Patch available CNA
- Personal Cloud Storage T1 VendorLenovo Affected before 5.3.6.t1 Fixed in 5.3.6.t1 Patch available CNA
- Personal Cloud Storage X1 VendorLenovo Affected before 5.3.8.x1 Fixed in 5.3.8.x1 Patch available CNA
- Personal Cloud Storage T2 VendorLenovo Affected before 5.3.8.t2 Fixed in 5.3.8.t2 Patch available CNA
- Personal Cloud Storage T2Pro VendorLenovo Affected before 5.3.7.t2-pro Fixed in 5.3.7.t2-pro Patch available CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:lenovo:a1_firmware:*:*:*:*:*:*:*:* | before 5.3.6.a1 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:a1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:lenovo:t1_firmware:*:*:*:*:*:*:*:* | before 5.3.6.t1 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:t1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:lenovo:x1_firmware:*:*:*:*:*:*:*:* | before 5.3.8.x1 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:x1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:lenovo:t2_firmware:*:*:*:*:*:*:*:* | before 5.3.8.t2 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:t2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:lenovo:t2pro_firmware:*:*:*:*:*:*:*:* | before 5.3.7.t2-pro | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:t2pro:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
- cpe:2.3:o:lenovo:a1_firmware:*:*:*:*:*:*:*:* Versions before 5.3.6.a1 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:a1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:lenovo:t1_firmware:*:*:*:*:*:*:*:* Versions before 5.3.6.t1 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:t1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:lenovo:x1_firmware:*:*:*:*:*:*:*:* Versions before 5.3.8.x1 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:x1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:lenovo:t2_firmware:*:*:*:*:*:*:*:* Versions before 5.3.8.t2 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:t2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:lenovo:t2pro_firmware:*:*:*:*:*:*:*:* Versions before 5.3.7.t2-pro Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:t2pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
Remediation
- Fix · CNA Personal Cloud Storage A1 (Lenovo) Fixed in 5.3.6.a1
- Fix · CNA Personal Cloud Storage T1 (Lenovo) Fixed in 5.3.6.t1
- Fix · CNA Personal Cloud Storage X1 (Lenovo) Fixed in 5.3.8.x1
- Fix · CNA Personal Cloud Storage T2 (Lenovo) Fixed in 5.3.8.t2
- Fix · CNA Personal Cloud Storage T2Pro (Lenovo) Fixed in 5.3.7.t2-pro
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Lenovo Personal Cloud Storage A1, Personal Cloud Storage T1 and 3 more products 5.3.6.a1, 5.3.6.t1 and 3 more versions
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2021-19009 Hard-coded credentials in Lenovo Personal Cloud Storage A1Priority LOW 38
- TI-2021-19011 OS command injection in Lenovo Personal Cloud Storage A1Priority LOW 36
- TI-2021-19008 Hard-coded credentials in Lenovo Personal Cloud Storage A1Priority LOW 30
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42851
- 2026-10-03 Alias added: GHSA-r4g7-77xq-h6p2
References
More Lenovo A1 Firmware vulnerabilities
- TI-2021-19009 Hard-coded credentials in Lenovo Personal Cloud Storage A1 CVSS 3.1HIGH 8.8
- TI-2021-19011 OS command injection in Lenovo Personal Cloud Storage A1 CVSS 3.1HIGH 8.0
- TI-2021-19008 Hard-coded credentials in Lenovo Personal Cloud Storage A1 CVSS 3.1MEDIUM 6.8
- TI-2021-19007 Missing authorization in Lenovo Personal Cloud Storage A1 CVSS 3.1MEDIUM 5.3
Sources
- CVE-2021-42851 · CVE Program
- CVE-2021-42851 · NVD
- FIRST EPSS
- GHSA-r4g7-77xq-h6p2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences