What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-12-12
• EPSS: 27.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-05-06 · updated 2026-06-17
• Weakness: CWE-434

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.

Affected products

• SierraWireless ALEOS: before 4.4.9; before 4.11.0; before 4.9.4 — fixed in 4.11.0, 4.4.9, 4.9.4

How to fix

Upgrade to a fixed version: SierraWireless ALEOS 4.11.0, 4.4.9, 4.9.4. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/152648/Sierra-Wireless-AirLink-ES450-ACEManager-upload.cgi-Remote-Code-Execution.html
• http://www.securityfocus.com/bid/108147
• https://ics-cert.us-cert.gov/advisories/ICSA-19-122-03
• https://talosintelligence.com/vulnerability_reports/TALOS-2018-0748
• http://packetstormsecurity.com/files/152648/Sierra-Wireless-AirLink-ES450-ACEManager-upload.cgi-Remote-Code-Execution.html
• http://www.securityfocus.com/bid/108147
• https://ics-cert.us-cert.gov/advisories/ICSA-19-122-03
• https://talosintelligence.com/vulnerability_reports/TALOS-2018-0748
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4063
• https://www.forescout.com/blog/ot-network-security-threats-industrial-routers-under-attack/

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