CVE-2021-42849A weak default password for the serial port was reported in some Lenovo Personal Cloud Storage devices that could allow unauthorized…
- 6.8MediumCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A weak default password for the serial port was reported in some Lenovo Personal Cloud Storage devices that could allow unauthorized device access to an attacker with physical access.
Timeline
ID reserved
By lenovo
- 7 months later
· 7 months later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| lenovoCNA (assigner) | 3.1 | Medium6.8 | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium6.8 | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Affected products
Lenovo · Personal Cloud Storage A1
- affected unspecified – < 5.3.6.a1
Lenovo · Personal Cloud Storage T1
- affected unspecified – < 5.3.6.t1
Lenovo · Personal Cloud Storage X1
- affected unspecified – < 5.3.8.x1
Lenovo · Personal Cloud Storage T2
- affected unspecified – < 5.3.8.t2
Lenovo · Personal Cloud Storage T2Pro
- affected unspecified – < 5.3.7.t2-pro
What to do
Solution: Update to the Lenovo Personal Cloud Storage device firmware listed in the product table in LEN-73439.
References
References1
- https://iknow.lenovo.com.cn/detail/dc_200017.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-29804 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-42849)Record last updated .