Sierra Wireless AirLink ES450 4.9.3 Webserver upload.cgi HTTP Request unrestricted upload

Summaryinfo

A vulnerability labeled as critical has been found in Sierra Wireless AirLink ES450 4.9.3. This issue affects some unknown processing of the file upload.cgi of the component Webserver. The manipulation as part of HTTP Request results in unrestricted upload. This vulnerability is cataloged as CVE-2018-4063. The attack may be launched remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Sierra Wireless AirLink ES450 4.9.3. Affected is an unknown part of the file upload.cgi of the component Webserver. The manipulation as part of a HTTP Request leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 04/25/2019. The weakness was shared 05/06/2019 (Website). The advisory is shared for download at securityfocus.com. This vulnerability is traded as CVE-2018-4063 since 01/02/2018. It is possible to launch the attack remotely. A authentication is necessary for exploitation. Technical details and a exploit are known. The MITRE ATT&CK project declares the attack technique as T1608.002.

It is declared as attacked. The vulnerability was handled as a non-public zero-day exploit for at least 11 days. During that time the estimated underground price was around $0-$5k. This issue was added on 12/12/2025 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 01/02/2026:

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2018-15849). The entries VDB-134422, VDB-134423, VDB-134425 and VDB-134426 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Sierra Wireless

Name

• AirLink ES450

Version

• 4.9.3

License

• commercial

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion