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CVE-2018-4063

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in Sierra Wireless AirLink ALEOS. For every flaw being used in attacks, see Exploited flaws.

CVE-2018-4063 is a security flaw in Sierra Wireless AirLink ALEOS. Attackers can run their own code on Sierra Wireless AirLink ALEOS. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 12 Dec 2025.[1]

Sierra Wireless AirLink ALEOS is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Sierra Wireless has published a fix or advice.

Description

CISA calls it an unrestricted upload of file with dangerous type in Sierra Wireless AirLink ALEOS. In its words: “Sierra Wireless AirLink ALEOS contains an unrestricted upload of file with dangerous type vulnerability. 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 impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.”[1]

The underlying weakness is unrestricted file upload (CWE-434), in MITRE’s list of common software weaknesses.[2]

It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; Sierra Wireless’s advisory has them[3]. CISA names the product as Sierra Wireless AirLink ALEOS.

Most families won’t have Sierra Wireless AirLink ALEOS; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 12 Dec 2025, 2,412 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 2 Jan 2026 to fix it.[1]

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 27%. That’s in the top 2% of the flaws it scores.[4]

CISA assesses it as not automatable: each attack takes some work.

CISA doesn’t say who was attacked, or how.

Fix

Sierra Wireless has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]

  1. Check whether you use it.Sierra Wireless AirLink ALEOS is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 2 Jan 2026 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 27%.[4]

See also

Other unrestricted file upload flaws

  • CVE-2026-48356, Adobe Commerce and Magento: unrestricted upload of file with dangerous type ·
  • CVE-2026-56291, Balbooa Forms: unrestricted upload of file with dangerous type ·
  • CVE-2026-48939, iCagenda: unrestricted upload of file with dangerous type ·
  • CVE-2026-48908, JoomShaper SP Page Builder: unrestricted upload of file with dangerous type ·
  • CVE-2024-7694, TeamT5 ThreatSonar Anti-Ransomware: unrestricted upload of file with dangerous type ·

Added the same day

  • CVE-2025-14174, Chrome and other Chromium browsers: out of bounds memory access ·

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability”. Known Exploited Vulnerabilities Catalog, added 12 Dec 2025.
  2. ^ National Institute of Standards and Technology. “CVE-2018-4063 Detail”. National Vulnerability Database, published 6 May 2019.
  3. ^ Sierra Wireless. Advisories and fixes: source.sierrawireless.com, source.sierrawireless.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.273, percentile 98.1, 31 Oct 2026.
  5. CVE Program. “CVE-2018-4063”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.