CVE-2018-4063
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA remote code execution vulnerability exists in the upload.cgi component of Sierra Wireless AirLink ES450 firmware 4.9.3. An authenticated attacker can send a specially crafted HTTP request to upload a file containing executable code, which becomes routable through the webserver. This allows the attacker to execute arbitrary commands on the affected device.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 4.4.9< 4.11.0< 4.9.4CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify device model and firmware versionAccess the AirLink ES450 web management interface or check the device documentation to locate the firmware version. This is typically found in the 'Device Status' or 'About' section of the admin console.Affected if The device is a Sierra Wireless AirLink ES450 or other Aleos-based gateway and the firmware version is below 4.4.9, below 4.9.4, or below 4.11.0
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Verify web management interface accessibilityDetermine if the web management interface (HTTP/HTTPS on ports 80 or 443) is reachable from untrusted networks. Check network firewall rules and device ACL settings.Affected if The web interface is exposed to networks outside the trusted management network, allowing external attackers to reach the login page
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Confirm authenticated access to upload.cgiAttempt to access the /cgi/upload.cgi endpoint or check if the file upload functionality is available in the web interface after authentication.Affected if The upload.cgi functionality is routable and accessible to authenticated users, meaning an attacker with valid credentials could leverage this endpoint
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Check for existing admin accountsReview the list of user accounts configured on the device. Determine if default or weak credentials may have been compromised.Affected if There are user accounts that could be exploited by an attacker to gain the authentication required to reach the vulnerable upload.cgi endpoint
You are affected if you are running an Aleos-based Sierra Wireless device with firmware version below 4.4.9, below 4.9.4, or below 4.11.0, and the web management interface with file upload capability is accessible to attackers who may obtain valid credentials.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data4.4.94.9.44.11.0
Apply the vendor-supplied firmware patch to address this vulnerability. If no patch is available, restrict network access to the device's management interface and consider implementing additional authentication controls or network segmentation to limit exposure.
- Consultation3.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-4063 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2018-4063 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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