Is CVE-2018-4063 exploited in the wild?

Yes. CVE-2018-4063 is known to be exploited in the wild, first recorded on 12 December 2025. Treat it as urgent.

How severe is CVE-2018-4063?

Critical severity, with a CVSS score of 8.8, published 12 December 2025.

Which products and versions are affected?

Sierra Wireless ALEOS up to (excluding) 4.4.9, 4.9.4, or 4.11.0 depending on hardware model.

Is there a fix for CVE-2018-4063?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2018-4063 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2018-4063?

Check whether you run Sierra Wireless AirLink ALEOS or Sierra Wireless ALEOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2018-4063: Sierra Wireless ALEOS unrestricted file upload in upload.cgi

CVE-2018-4063 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2025-12-12

Sierra Wireless AirLink gateways, which are industrial routers used to provide cellular connectivity for critical infrastructure and remote sites, contain a security flaw in their management interface. An attacker with valid login credentials can upload malicious files to the device's web server, allowing them to take full control of the router. This could lead to unauthorized access to the internal network, data interception, or a complete shutdown of remote communications.

Quick answers

Is CVE-2018-4063 exploited in the wild?: Yes. CVE-2018-4063 is known to be exploited in the wild, first recorded on 12 December 2025. Treat it as urgent.
How severe is CVE-2018-4063?: Critical severity, with a CVSS score of 8.8, published 12 December 2025.
Which products and versions are affected?: Sierra Wireless ALEOS up to (excluding) 4.4.9, 4.9.4, or 4.11.0 depending on hardware model.
Is there a fix for CVE-2018-4063?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2018-4063 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2018-4063?: Check whether you run Sierra Wireless AirLink ALEOS or Sierra Wireless ALEOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An unrestricted file upload vulnerability (CWE-434) exists in the upload.cgi functionality of the Sierra Wireless ALEOS operating system used in AirLink gateways. The flaw allows an authenticated attacker to send a specially crafted HTTP request to upload executable files to a directory accessible by the webserver. Once uploaded, these files can be executed with the privileges of the webserver, leading to full system compromise. This vulnerability has been observed being exploited in the wild. Patches are available in ALEOS versions 4.4.9, 4.9.4, and 4.11.0 depending on the specific hardware model (e.g., ES450, GX450, RV50).

Affected products

Sierra Wireless ALEOS up to (excluding) 4.4.9, 4.9.4, or 4.11.0 depending on hardware model

Timeline

2018-07-48: other: Talos vulnerability report ID
2019-05-02: advisory: CISA ICSA-19-122-03 published
2025-12-12: kev added: Added to CISA Known Exploited Vulnerabilities catalog

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