CVE-2018-4063
Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 2 January 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 27.06% probability · 98th percentile
- CISA KEV
- Listed 12 December 2025 · due 2 January 2026
- Weakness
- CWE-434
- Affected
- sierrawireless/aleos
- Source
- talos-cna@cisco.com
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. 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
References
- http://packetstormsecurity.com/files/152648/Sierra-Wireless-AirLink-ES450-ACEManager-upload.cgi-Remote-Code-Execution.htmlExploit, VDB Entry
- http://www.securityfocus.com/bid/108147Broken Link
- https://ics-cert.us-cert.gov/advisories/ICSA-19-122-03Third Party Advisory, US Government Resource
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0748Exploit, Third Party Advisory
- http://packetstormsecurity.com/files/152648/Sierra-Wireless-AirLink-ES450-ACEManager-upload.cgi-Remote-Code-Execution.htmlExploit, VDB Entry
- http://www.securityfocus.com/bid/108147Broken Link
- https://ics-cert.us-cert.gov/advisories/ICSA-19-122-03Third Party Advisory, US Government Resource
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0748Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4063US Government Resource
- https://www.forescout.com/blog/ot-network-security-threats-industrial-routers-under-attack/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.