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…
- 8.8HighCVSS base score
- 27.3%Exploitation in 30 daysEPSS · top 1.9% of all CVEs
- YesKnown exploitedin CISA's KEV since 12 Dec 2025
- YesPublic exploitsa reference or SSVC says so
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Sierra Wireless AirLink ALEOS Unrestricted Upload of File with Dangerous Type Vulnerability.
- Added
- 12 Dec 2025
- Fix due (US federal)
- 2 Jan 2026
- Used by ransomware
- Not known
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 12 Dec 2025.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.
Timeline
ID reserved
By talos
- 16 months later
· 16 months later
Published
- 7 years later
· 7 years later
Added to CISA KEV
Known exploited in the wild
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 27.3% · top 1.9% of all CVEs (9 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
Sierra Wireless
- affected Sierra Wireless AirLink ES450 FW 4.9.3
References
6
- http://packetstormsecurity.com/files/152648/Sierra-Wireless-AirLink-ES450-ACEManager-upload.cgi-Remote-Code-Execution.html (opens in a new tab)x_refsource_MISCx_transferred
- https://ics-cert.us-cert.gov/advisories/ICSA-19-122-03 (opens in a new tab)x_refsource_MISCx_transferred
- 108147 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0748 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.forescout.com/blog/ot-network-security-threats-industrial-routers-under-attack/ (opens in a new tab)third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4063 (opens in a new tab)government-resource
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2018-15849 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2018-4063)Record last updated .