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CVE-2021-3378

93
FAUCET Score

CVE-2021-3378 is a critical arbitrary file upload vulnerability affecting FortiLogger version 4.4.2.2. An unauthenticated attacker can upload malicious files by sending a specially crafted request to the Config/SaveUploadedHotspotLogoFile endpoint. With a CVSS score of 9.8, this vulnerability allows for complete compromise of confidentiality, integrity, and availability. While not listed on the KEV catalog, public exploit code, including a Metasploit module and Nuclei templates, is readily available, indicating a high likelihood of exploitation. Despite the high risk, there is minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.2.0CPE matchmatch criteria
cpe:2.3:a:fortilogger:fortilogger:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
97.51%
Probability of exploitation in next 30 days
EPSS Percentile
99.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
Metasploit: FortiLogger Arbitrary File Upload Exploit · Feb 26, 2021
Nuclei: CVE-2021-3378 · Mar 1, 2021
ExploitDB: EDB-49600 · Mar 1, 2021
This CVE's current EPSS score of 0.9751 is in the 99th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/161601/FortiLogger-4.4.2.2-Arbitrary-File-Upload.html
ExploitThird Party AdvisoryVDB Entry
packetstormsecurity.com / files/161974/FortiLogger-Arbitrary-File-Upload.html
ExploitThird Party AdvisoryVDB Entry
github.com / erberkan/fortilogger_arbitrary_fileupload
ExploitThird Party Advisory