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Exploited vulnerability · CISA KEV

Is CVE-2018-4063 exploited? Yes: in CISA KEV since 12 Dec 2025

Gociux · Sierra Wireless AirLink ALEOS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2018-4063, Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 12 Dec 2025, 2412 days after it was published. It affects Sierra Wireless AirLink ALEOS. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 12 Dec 2025
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.8CVSS 3.1 · high
US federal due2 Jan 2026BOD 22-01 deadline

What it is

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.

VendorSierra Wireless (1 exploited CVE in KEV)
ProductAirLink ALEOS
VulnerabilitySierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability
WeaknessCWE-434
Published6 May 2019
Added to KEV12 Dec 2025
Reported by (CNA)talos

What to do

  1. Check whether you run it. Look for AirLink ALEOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Sierra Wireless CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 6 May 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Sierra Wireless.

References

Questions

Is CVE-2018-4063 being exploited?

Yes. CISA added CVE-2018-4063 to the Known Exploited Vulnerabilities catalog on 12 Dec 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2018-4063 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2018-4063?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Sierra Wireless's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected AirLink ALEOS and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in December 2025 · act-now radar.

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