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CVE-2018-4063

8.8
HIGHCVSS v3.1 Base Score
1.88%
LOW RiskEPSS (83rd percentile)
KEV

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.

Published: 5/6/2019
Modified: 12/15/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability

Vendor / Product:

Sierra Wireless AirLink ALEOS

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.

Due Date: 1/2/2026(OVERDUE)
Added to KEV:

12/12/2025

Notes:

https://www.cisa.gov/news-events/ics-advisories/icsa-19-122-03 ; https://source.sierrawireless.com/resources/airlink/software_reference_docs/technical-bulletin/sierra-wireless-technical-bulletin---swi-psa-2019-003 ; https://source.sierrawireless.com/resources/airlink/hardware_reference_docs/airlink_es450_eol ; https://nvd.nist.gov/vuln/detail/CVE-2018-4063

Vulnerability Summary

CVSS v3 Score

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2 Score

9

AV:N/AC:L/Au:S/C:C/I:C/A:C

EPSS Score (Exploitation Probability)

1.88%LOW Exploitation Risk
83rd percentile

This vulnerability has a 1.88% probability of being exploited in the next 30 days, ranking higher than 83% of all scored CVEs.

CWE Classification

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Similar SeverityHIGH