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CVE-2025-34299

CriticalPublished

Monsta FTP <= 2.11 Unauthenticated Arbitrary File Upload

Published: Nov 7, 2025
Updated: May 14, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 8, 2026

Primary CVSS

9.3/ 10Critical

nvd · CVSS 4.0

CVSS: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

EPSS probability estimate

72.9%

High · next 30 days

Percentile: 99.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-34299-labResearch
Docker test environment for CVE-2025-34299 - Monsta FTP Pre-Auth RCE vulnerability
CVE-2025-34299Detection
Detection for CVE-2025-34299

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