CVE-2018-4063KEV · OVERDUE

Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability

High · published May 6, 2019

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 98.0th percentile for exploit probability.

293
days past CISA
deadline
CVSS v3.1
8.8
EPSS
27%
Percentile
98.0
In the wild
Confirmed
What it is

🚨 An attacker can upload malicious code to a vulnerable web server with just one crafty HTTP request! This critical remote code execution flaw in Sierra Wireless AirLink ES450 is no joke. 🔥 Think of this vulnerability like a sneaky delivery person who tricks their way into a secure building and drops off a package filled with malware instead of a pizza! Once inside, the malicious package can wreak havoc without anyone being the wiser. If exploited, an attacker could take complete control of the web server, executing any command they desire. This could lead to data breaches, service disruptions, or even the installation of additional malware, putting sensitive information at risk and creating a potential disaster for affected organizations.

Put simply

Think of this vulnerability like a sneaky delivery person who tricks their way into a secure building and drops off a package filled with malware instead of a pizza! Once inside, the malicious package can wreak havoc without anyone being the wiser. This vulnerability occurs in the upload.cgi functionality, allowing authenticated users to send specially crafted HTTP requests that upload executable files to the server, effectively facilitating remote code execution.

What to do

If exploited, an attacker could take complete control of the web server, executing any command they desire. This could lead to data breaches, service disruptions, or even the installation of additional malware, putting sensitive information at risk and creating a potential disaster for affected organizations. Immediate action is required: upgrade to the latest firmware version provided by Sierra Wireless, and strictly limit authentication to trusted users only. It's also essential to implement robust monitoring to catch any unauthorized file uploads before they cause damage. You've got this! With these steps, you can lock down your systems and become a security hero! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.27260 · 98.0th percentile
Published
2019-05-06T18:43Z
KEV added
2025-12-12 · due 2026-01-02
EPSS history
Timeline
  • 12 DEC 00:00Z
    Added to CISA KEV — remediate by Jan 2
    kev
  • 06 MAY 18:43Z
    An exploitable remote code execution vulnerability exists in the upload.cgi functionality of Sierra Wireless AirLink ES450 FW 4.9.3
    cvelistv5