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Fencer Vulns
critical 9.8

CVE-2021-3378 in the critical feed json

FortiLogger 4.4.2.2 is affected by Arbitrary File Upload by sending a "Content-Type: image/png" header to Config/SaveUploadedHotspotLogoFil…

published 2021-02-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26708

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
97.5%
EPSS 97.5% chance of exploitation in 30 days, percentile 99.9%
public exploits
2
Metasploit, Exploit-DB, plus a Nuclei check

Summary

FortiLogger 4.4.2.2 is affected by Arbitrary File Upload by sending a "Content-Type: image/png" header to Config/SaveUploadedHotspotLogoFile and then visiting Assets/temp/hotspot/img/logohotspot.asp.

Patch / fix

  • fortilogger fortilogger 5.2.0

Timeline

  1. Published
  2. First public exploit (Metasploit exploit/windows/http/fortilogger_arbitrary_fileupload)

Exploit prediction

97.51% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/windows/http/fortilogger_arbitrary_fileupload FortiLogger Arbitrary File Upload Exploit metasploit exploit, normal rank, 2021-02-26
  • EDB-49600 FortiLogger 4.4.2.2 - Unauthenticated Arbitrary File Upload (Metasploit) webapps, 2021-03-01
  • Nuclei template FortiLogger 4.4.2.2 - Arbitrary File Upload nuclei detection template
  • github.com https://github.com/erberkan/fortilogger_arbitrary_fileupload referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/161601/FortiLogger-4.4.2.2-Arbitrary-File-Upload.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/161974/FortiLogger-Arbitrary-File-Upload.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.