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
- 27.26% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 12 December 2025 · due 2 January 2026
- Weakness
- CWE-434
- Affected
- sierrawireless/aleos
- Source
- talos-cna@cisco.com
EPSS 27.3% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.