How severe is CVE-2018-4063?

CVE-2018-4063 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2018-4063?

Affected package information for CVE-2018-4063 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2018-4063?

No fixed version has been published for CVE-2018-4063 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2018-4063 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2018-4063, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2018-4063?

CVE-2018-4063 has an EPSS (Exploit Prediction Scoring System) score of 1.9%, placing it in the 84th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2018-4063 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2018-4063 (Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-12-12. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-01-02. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2018-4063?

CVE-2018-4063 is classified as Unrestricted File Upload (CWE-434). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2018-4063?

CVE-2018-4063 affects sierrawireless aleos. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2018-4063 published, and has it been updated?

CVE-2018-4063 was published on May 6, 2019 and was last updated on December 15, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-12-12 — agencies required to remediate by 2026-01-02

CVE-2018-4063

HIGH

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,…

Published

May 6, 2019

Updated

Dec 15, 2025

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

1.9%probability of exploitation in next 30 days

Lower Risk84th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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 Products

1 product · 3 configurations

aleossierrawireless

< 4.9.4

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An exploitable remote code execution vulnerability exists in the upload.…

talosintelligence.comNVDMay 2019

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2018-4063 in your stack?

O3 detects CVE-2018-4063 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

8.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

Low

UI:User Interaction

None

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE Classification

CWE-434Unrestricted File Upload

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

May 6, 2019

First exploit

May 7, 2019

1 day after disclosure — rapid exploitation

KEV added

Dec 12, 2025

Last updated

Dec 15, 2025

Identifiers

CVE-2018-4063

References

Advisoryics-cert.us-cert.gov Advisoryics-cert.us-cert.gov Exploit / PoCpacketstormsecurity.com Exploit / PoCtalosintelligence.com Exploit / PoCpacketstormsecurity.com Exploit / PoCtalosintelligence.com Exploit / PoCforescout.com Websecurityfocus.com Websecurityfocus.com Webcisa.gov

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.