Monsta FTP <= 2.11 Unauthenticated Arbitrary File Upload

Advisories

severity: critical
date: November 7, 2025
Affecting: Monsta FTP <= 2.11
CVE: CVE-2025-34299
CWE: CWE-434 Unrestricted Upload of File with Dangerous Type
CVSS: 9.3
CVSS V4 Vector: 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
References: Monsta FTP Release Notes
watchTowr Blog
Credit: Sonny of watchTowr
Description: 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.