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CVE-2018-4063

High 8.8 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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.

Metrics

CVSS 3.1
8.8 (HIGH) Score source: NVD CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS — exploit probability
27% (percentile: 98) as of 2 November 2026
CWE
CWE-434

Affected products

sierrawireless: aleos; sierrawireless: airlink es440; sierrawireless: airlink gx400; sierrawireless: airlink gx440; sierrawireless: airlink ls300; sierrawireless: airlink lx40; sierrawireless: airlink lx60; sierrawireless: airlink mp70; sierrawireless: airlink mp70e; sierrawireless: airlink rv50; sierrawireless: airlink rv50x; sierrawireless: airlink es450; sierrawireless: airlink gx450

References