CVE-2018-4063
HighExploitedPublic exploitAn exploitable remote code execution vulnerability exists in the upload.cgi functionality of Sierra Wireless AirLink ES450 FW 4.9.3.
Published May 6, 2019 · Updated May 22, 2026
Key Facts
Patch immediately- CVE-2018-4063 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Aleos (Sierrawireless), Sierra Wireless.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 11, 2025. Public exploit code is available.
- EPSS estimates a 27% probability of exploitation in the next 30 days.
- Fixed versions are available, including Aleos 4.4.9.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
27%
Higher than 98.0% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2018-4063 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 12, 2025 | Jan 2, 2026 | Not reported |
| Industry KEV feed | Dec 11, 2025 | Jan 2, 2026 | Not reported |
| CIRCL KEV | Dec 12, 2025 | Jan 2, 2026 | Not reported |
| ENISA EUVD | Dec 12, 2025 | n/a | Not reported |
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| AleosSierrawireless | See advisory | 4.4.9 |
| Sierra Wireless | >= Sierra Wireless AirLink ES450 FW 4.9.3 | n/a |
Patched Releases
Aleos
4.4.9
Timeline
Publicly disclosed
May 6, 2019
Added to Industry KEV feed
Dec 11, 2025
Added to CISA KEV
Dec 12, 2025
Added to CIRCL KEV
Dec 12, 2025
Added to ENISA EUVD
Dec 12, 2025
Last updated
May 22, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://ics-cert.us-cert.gov/advisories/ICSA-19-122-03
- exploithttp://packetstormsecurity.com/files/152648/Sierra-Wireless-AirLink-ES450-ACEManager-upload.cgi-Remote-Code-Execution.html
- exploithttps://talosintelligence.com/vulnerability_reports/TALOS-2018-0748
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
An exploitable remote code execution vulnerability exists in the upload.cgi functionality of Sierra Wireless AirLink ES450 FW 4.9.3.
Affected: Aleos (Sierrawireless); Sierra Wireless versions >= Sierra Wireless AirLink ES450 FW 4.9.3. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 11, 2025.
Yes. It was added on Dec 12, 2025 with a federal remediation due date of Jan 2, 2026.
Public exploit code is available.
Fixed versions are available, including Aleos 4.4.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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