CVE-2021-21892 Memory corruption in Lantronix

Critical 9.9 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: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-21892?

CVE-2021-21892 is a critical memory corruption vulnerability in Lantronix, published on 22 Dec 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A stack-based buffer overflow vulnerability exists in the Web Manager FsUnmount functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Weakness: CWE-787, CWE-121

Which versions are affected by CVE-2021-21892?

It affects 1 product.

Products include Lantronix Premierwave 2050 Firmware.

How do I fix CVE-2021-21892?

No fix has been published for CVE-2021-21892 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-2021-21892 being exploited?

There is no known exploitation of CVE-2021-21892 in the wild and no public exploit code.

Sources

Also known as GHSA-wp8f-gcf7-896v.