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.

cat cve-2018-4063.json

Vendor: Sierra Wireless
Product: AirLink ALEOS
CVSS: 8.8
EPSS (exploit probability): 27.3%
Status: kev
CISA patch-by (BOD 22-01): January 2, 2026
Added to KEV: December 12, 2025
Source: https://nvd.nist.gov/vuln/detail/CVE-2018-4063

Is CVE-2018-4063 being exploited?

Yes. CISA added CVE-2018-4063 to its Known Exploited Vulnerabilities catalog on December 12, 2025. CISA only lists a CVE when it has reliable evidence of exploitation in the wild.

FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 27.3% (scored October 18, 2026).

CISA KEV[ LISTED ]
ENISA EUVD (exploited)[ — ]
CIRCL KEV[ — ]

Catalog snapshot 2026-10-25. Full cross-catalog view: /kev-comparison

CVE-2018-4063 timeline

2019-05-06Published to NVD
2025-12-12Added to CISA KEV+2412d

Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON

What to do

CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

US federal civilian agencies must remediate by January 2, 2026 (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.