CVE-2021-21891 Memory corruption in Lantronix

Critical 9.1 Published 22 Dec 2021 Updated 3 Aug 2024

An authenticated attacker can trigger a stack-based buffer overflow in the Web Manager to achieve remote code execution on Lantronix PremierWave devices.

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-2021-21891?

CVE-2021-21891 is a critical memory corruption 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 stack-based buffer overflow vulnerability exists in the Web Manager FsBrowseClean functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution in the vulnerable portion of the branch (deletefile). An attacker can make an authenticated HTTP request to trigger this vulnerability.

Weakness: CWE-787, CWE-121

Which versions are affected by CVE-2021-21891?

It affects 1 product.

Products include Lantronix Premierwave 2050 Firmware.

How do I fix CVE-2021-21891?

No fix has been published for CVE-2021-21891 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-21891 being exploited?

There is no known exploitation of CVE-2021-21891 in the wild and no public exploit code.

Sources

Also known as GHSA-c2pc-v7xf-jj54.