CVE-2021-21895 Path traversal in Lantronix

Critical 9.1 Published 22 Dec 2021 Updated 3 Aug 2024

An authenticated attacker can exploit a directory traversal flaw in the Web Manager to overwrite arbitrary files on the device.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-21895?

CVE-2021-21895 is a critical path traversal vulnerability in Lantronix, published on 22 Dec 2021. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A directory traversal vulnerability exists in the Web Manager FsTFtp functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to FsTFtp file overwrite. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Weakness: CWE-22

Which versions are affected by CVE-2021-21895?

It affects 1 product.

Products include Lantronix Premierwave 2050 Firmware.

How do I fix CVE-2021-21895?

No fix has been published for CVE-2021-21895 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2021-21895 being exploited?

There is no known exploitation of CVE-2021-21895 in the wild and no public exploit code.

Sources

Also known as GHSA-pgf6-x544-v9h8.