CVE-2021-3378

Name: CVE-2021-3378
Creator: NVD / NIST
Published: 2021-02-01T23:15:12.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 97.51%

Last modified Jun 17, 2026

CVE-2021-3378 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 97.51% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

97.51%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Fortilogger	Fortilogger	< 5.2.0

References

http://packetstormsecurity.com/files/161601/FortiLogger-4.4.2.2-Arbitrary-File-Upload.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161974/FortiLogger-Arbitrary-File-Upload.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/erberkan/fortilogger_arbitrary_fileuploadExploit, Third Party Advisory
http://packetstormsecurity.com/files/161601/FortiLogger-4.4.2.2-Arbitrary-File-Upload.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161974/FortiLogger-Arbitrary-File-Upload.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/erberkan/fortilogger_arbitrary_fileuploadExploit, Third Party Advisory

Timeline

Published: Feb 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3378?

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.

How severe is CVE-2021-3378?

CVE-2021-3378 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 97.51% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3378?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3378?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST