CVEs / CVE-2018-4063
CVE-2018-4063: Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability
- Known exploited in the CISA KEV catalog since 12 Dec 2025
- high 8.8 CVSS 3.1 (NVD)
- EPSS 27.2% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| n/a Sierra Wireless | Sierra Wireless AirLink ES450 FW 4.9.3 | — |
Exploitation
| In CISA KEV since | 12 Dec 2025 |
|---|---|
| Due date for US federal agencies | 2 Jan 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 8.8 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-434 |
References
- CVE-2018-4063 on NVD
- CVE-2018-4063 in the CISA KEV catalog
- https://www.cisa.gov/news-events/ics-advisories/icsa-19-122-03 (cited by CISA)
- https://source.sierrawireless.com/resources/airlink/software_reference_docs/technical-bulletin/sierra-wireless-technical-bulletin---swi-psa-2019-003 (cited by CISA)
- https://source.sierrawireless.com/resources/airlink/hardware_reference_docs/airlink_es450_eol (cited by CISA)
- http://packetstormsecurity.com/files/152648/Sierra-Wireless-AirLink-ES450-ACEManager-upload.cgi-Remote-Code-Execution.html Exploit, VDB Entry
- http://www.securityfocus.com/bid/108147 Broken Link
- https://ics-cert.us-cert.gov/advisories/ICSA-19-122-03 Third Party Advisory, US Government Resource
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0748 Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4063 US Government Resource
- https://www.forescout.com/blog/ot-network-security-threats-industrial-routers-under-attack/ Exploit, Third Party Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.