CVE-2025-34299

Monsta FTP <= 2.11 Unauthenticated Arbitrary File Upload

Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file uploads. This flaw enables attackers to execute arbitrary code by uploading a specially crafted file from a malicious (S)FTP server.

Affected

Monsta Limited of New Zealand · Monsta FTP

CVSS v4.0 VULNCHECK

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

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

EPSS

72.68% chance of exploitation in the next 30 days, 99th percentile

Nuclei

critical · CWE-434

Published

2025-11-07

Updated

2026-05-14

Proof-of-concept exploits (2)

• https://labs.watchtowr.com/whats-that-coming-over-the-hill-monsta-ftp-remote-code-executi…
• Chocapikk/CVE-2025-342995★ · 2025-11-19

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34299.yaml

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/monsta_ftp_downloadfi…

Security advisories

• https://labs.watchtowr.com/whats-that-coming-over-the-hill-monsta-ftp-remote-code-executi…
• https://www.vulncheck.com/advisories/monsta-ftp-unauthenticated-arbitrary-file-upload
• https://www.monstaftp.com/notes

References

• CVE Record
• NVD entry