Threats / Sierra Wireless / CVE-2018-4063
CVE-2018-4063
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-09-19
Sierra Wireless AirLink ALEOS vulnerability
Sierra Wireless AirLink ALEOS allows authenticated attackers to upload arbitrary files with dangerous types to the webserver, enabling execution of malicious code on affected devices.
Verdict
Today item — known-exploited.
An authenticated attacker can exploit unrestricted file upload functionality to place executable code on the AirLink ALEOS webserver, achieving remote code execution. The product is reportedly end-of-life or end-of-service.
CISA KEV Yes · 2025-12-124EPSS 0.27059 (verify live)5CVSS 8.8 (CISA)3CISA SSVC Exploitation: active · Automatable: no · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
5 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-12).
Probability (EPSS)
EPSS 0.27059 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) · Affected: Sierra Wireless, AirLink ALEOS. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-434 Unrestricted File Upload — weakness family: Path traversal / file.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 2412 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I authenticate to the AirLink ALEOS web interface using valid credentials.
Business
Legitimate administrative access is a prerequisite for exploitation, limiting exposure to insider threats or compromised accounts.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I craft a malicious HTTP request that uploads an executable file, bypassing file type validation.
Business
The upload mechanism fails to restrict dangerous file types, creating a direct path to code execution.
3
Lateral reach — past segmentation narrative 3
Attacker
I access the uploaded executable through the webserver, triggering code execution on the device.
Business
The attacker gains full control of the AirLink ALEOS gateway, compromising network integrity and all connected systems.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by talosCNA
Credited with finding itNo finder is named in the public CVE record or the scanned vendor advisory — attribution scoped to the sources checked.
Found an error? Propose a correction.
A correction is a cited counter-claim — it must cite a source,
gets reviewed by a second human, and is never auto-applied. See the
correction convention and our identity
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