---
id: "CVE-2018-4063"
kind: "vulnerability"
aliases: ["CVE-2018-4063"]
title: "sierrawireless aleos: An exploitable remote code execution vulnerability exists in the upload.cgi functionality of Sierra Wireless AirLink\u2026"
severity: "critical"
cvss: 9.0
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Sierra Wireless AirLink ALEOS", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "sierrawireless aleos", "fixed": ["4.4.9"], "affected": "< 4.4.9", "ecosystem": "vendor"}, {"name": "sierrawireless aleos", "fixed": ["4.11.0"], "affected": "< 4.11.0", "ecosystem": "vendor"}, {"name": "sierrawireless aleos", "fixed": ["4.9.4"], "affected": "< 4.9.4", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["airlink", "aleos", "cellular-router", "exploited", "infrastructure", "iot", "sierra-wireless"]
not_affected_if: ["no-aleos-devices"]
published_at: "2019-05-06T19:29:00+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-4063", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-4063", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

# sierrawireless aleos: An exploitable remote code execution vulnerability exists in the upload.cgi functionality of Sierra Wireless AirLink…

Sierra Wireless AirLink ALEOS cellular routers accept a crafted HTTP upload that stores executable code on the device's web server. An attacker who can log in can then run that code on the router.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Sierra Wireless AirLink ALEOS affected ? fixed ?
- vendor:sierrawireless aleos affected < 4.4.9 fixed 4.4.9
- vendor:sierrawireless aleos affected < 4.11.0 fixed 4.11.0
- vendor:sierrawireless aleos affected < 4.9.4 fixed 4.9.4

## How to check

Identify any Sierra Wireless AirLink ALEOS devices on the network and note their firmware version.

## Fix

Apply the vendor mitigations or discontinue the device, since the product may be end-of-life and no fixed version is named in the sources.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-4063
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2018-4063

## From the sources

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 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_