CVE-2018-4063: in the CISA KEV catalogue
Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability. CISA added CVE-2018-4063 to the Known Exploited Vulnerabilities catalogue on 2025-12-12 with a default due date of 2026-01-02. Known ransomware campaign use: Unknown. Forensic triage flag: No.
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 description)
- Vendor / product
- Sierra Wireless AirLink ALEOS
- CWE
- CWE-434
- CISA 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.
- EPSS
- 27%, percentile 98 (scored 2026-11-03)
EPSS puts about 27 in 100 odds (27%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 98% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
- 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
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2018-4063 in the CISA KEV catalogue?
Yes. CISA added CVE-2018-4063 (Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2025-12-12. CISA's default due date for it is 2026-01-02.
Is CVE-2018-4063 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2018-4063. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2018-4063?
CISA's 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.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2018-4063