CVE-2021-42851 Missing authorization in Personal Cloud Storage A1

Medium 6.3 Published 18 May 2022 Updated 4 Aug 2024

Unauthenticated attackers can create standard user accounts on Lenovo Personal Cloud Storage devices, potentially leading to unauthorized access.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-42851?

CVE-2021-42851 is a medium-severity missing authorization vulnerability in Lenovo Personal Cloud Storage A1, published on 18 May 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability was reported in some Lenovo Personal Cloud Storage devices that could allow an unauthenticated user to create a standard user account.

Weakness: CWE-862

Which versions are affected by CVE-2021-42851?

It affects 5 products.

Products include Lenovo A1 Firmware, Lenovo T1 Firmware, Lenovo T2 Firmware, Lenovo T2pro Firmware, Lenovo X1 Firmware.

How do I fix CVE-2021-42851?

No fix has been published for CVE-2021-42851 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-42851 being exploited?

There is no known exploitation of CVE-2021-42851 in the wild and no public exploit code.

Sources

Also known as GHSA-r4g7-77xq-h6p2.