How severe is CVE-2018-4063?

CVE-2018-4063 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-4063 being actively exploited?

Yes. CVE-2018-4063 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-12-12, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-4063?

CVE-2018-4063 affects Sierrawireless Aleos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4063?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-4063 have an EU (EUVD) identifier?

Yes. CVE-2018-4063 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-15849. It is also flagged as exploited in the EUVD (since 2025-12-12).

When was CVE-2018-4063 published?

CVE-2018-4063 was published on 2019-05-06 and last updated on 2026-06-17.

CVE-2018-4063

CVE-2018-4063 is a high-severity vulnerability in Sierrawireless Aleos with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-12-12). The underlying weakness is classified as CWE-434.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 28% (98th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-12-12)
EU (EUVD) id: EUVD-2018-15849
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-12-12)
Weakness: CWE-434
Affected product: Sierrawireless Aleos
Published: 2019-05-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-4063?: 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.
How severe is CVE-2018-4063?: CVE-2018-4063 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-4063 being actively exploited?: Yes. CVE-2018-4063 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-12-12, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-4063?: CVE-2018-4063 affects Sierrawireless Aleos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4063?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-4063 have an EU (EUVD) identifier?: Yes. CVE-2018-4063 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-15849. It is also flagged as exploited in the EUVD (since 2025-12-12).
When was CVE-2018-4063 published?: CVE-2018-4063 was published on 2019-05-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:sierrawireless:aleos:*:*:*:*:*:*:*:*

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