CVE-2018-4063
Published: December 12, 2025
Official Description
Sierra Wireless AirLink ALEOS contains an unrestricted upload of file with dangerous type vulnerability. 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. The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.
CISA KEV Advisory
Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability
Sierra Wireless AirLink ALEOS contains an unrestricted upload of file with dangerous type vulnerability. 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. The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Risk Analysis
This vulnerability in Sierra Wireless AirLink ALEOS allows an authenticated attacker to upload a file with a dangerous type, leading to the execution of arbitrary code on the webserver. The high CVSS score of 8.8 and inclusion in CISA's KEV catalog confirm its severity and active exploitation. Users are advised to discontinue product utilization as it may be end-of-life.
Active exploitation of this vulnerability has been observed in the wild. It is remotely exploitable, requiring an authenticated HTTP request.
Users should discontinue the use of impacted Sierra Wireless AirLink ALEOS products if they are end-of-life. If continued use is unavoidable, ensure strong authentication is in place and restrict network access to the device.
Technical Analysis
CVE-2018-4063 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.
CISA has added CVE-2018-4063 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
CVSS v3.1 Vector Breakdown
Exploit & PoC Resources
All References (4)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2018-4063 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1