CVE-2018-4063 Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type

Exploited in the wild High 8.8 Published 6 May 2019 Updated 22 May 2026

An attacker with valid credentials can upload executable files via the web interface, leading to remote code execution on the device.

Exploited in the wild: Since 12 Dec 2025
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-4063?

CVE-2018-4063 is a high-severity vulnerability in Sierra Wireless, published on 6 May 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An exploitable remote code execution vulnerability exists in the upload.cgi functionality of Sierra Wireless AirLink ES450 FW 4.9.3. A specially crafted HTTP request can upload a file, resulting in executable code being uploaded, and routable, to the webserver. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Weakness: CWE-434

Which versions are affected by CVE-2018-4063?

It affects 1 product.

Products include Sierrawireless Aleos.

How do I fix CVE-2018-4063?

No fix has been published for CVE-2018-4063 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 2 Jan 2026.

Is CVE-2018-4063 being exploited?

Yes. Attackers have exploited CVE-2018-4063 in the wild since at least 12 Dec 2025.

Sources

Also known as GHSA-96pr-35f4-cf4c.