Known exploited vulnerability
CVE-2018-4063
The short answer
CVE-2018-4063 affects n/a Sierra Wireless and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-12-12: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-434.
Severity
8.8 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Dec 12, 2025
Federal due date Jan 2, 2026
EPSS, next 30 days
27%
Higher than 98% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Sierra Wireless. NVD's record lists the exact affected versions.
References
- ics-cert.us-cert.gov/advisories/ICSA-19-122-03 Third Party AdvisoryUS Government Resource
- talosintelligence.com/vulnerability_reports/TALOS-2018-0748 ExploitThird Party Advisory
- ics-cert.us-cert.gov/advisories/ICSA-19-122-03 Third Party AdvisoryUS Government Resource
- talosintelligence.com/vulnerability_reports/TALOS-2018-0748 ExploitThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4063 US Government Resource
- www.forescout.com/blog/ot-network-security-threats-industrial-routers-under-attack/ ExploitThird Party Advisory
Questions
Is CVE-2018-4063 being exploited?
Yes. CISA added CVE-2018-4063 to its Known Exploited Vulnerabilities catalog on 2025-12-12, with a federal remediation due date of 2026-01-02.
How do I fix CVE-2018-4063?
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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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