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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: Monsta FTP (v2.11 & earlier) has an **unauthenticated arbitrary file upload** flaw.…
👥 **Affected**: **Monsta FTP** versions **2.11 and earlier**. 🌍 Vendor: Monsta Limited (New Zealand). Over **5,000 instances** are currently exposed online.
Q4What can hackers do? (Privileges/Data)
🔓 **Hacker Powers**: **Unauthenticated** access required. Attackers can execute **arbitrary PHP code**, upload web shells, and gain **full control** over the target server's file system and processes.
Q5Is exploitation threshold high? (Auth/Config)
⚡ **Threshold**: **LOW**. No authentication is needed to trigger the upload mechanism. The attack vector involves connecting to a malicious (S)FTP server, making it easy to exploit remotely.
Q6Is there a public Exp? (PoC/Wild Exploitation)
💣 **Exploits**: **YES**. Multiple public PoCs exist on GitHub (e.g., rxerium, Blackash-CVE). Nuclei templates are also available. **Active exploitation** in the wild has been reported.
Q7How to self-check? (Features/Scanning)
🔍 **Self-Check**: Use **Nuclei** with the CVE-2025-34299 template. Look for exposed Monsta FTP instances. Check if the `downloadFile` endpoint is accessible without auth and allows fetching from external hosts.
Q8Is it fixed officially? (Patch/Mitigation)
🔧 **Fix**: **YES**. The vendor has released patch notes. Users should update Monsta FTP to the latest version immediately. Refer to `https://www.monstaftp.com/notes/` for official guidance.
Q9What if no patch? (Workaround)
🚧 **No Patch?**: **Mitigation**: Block outbound connections to untrusted (S)FTP servers. Restrict network access to the Monsta FTP interface. Disable the `downloadFile` feature if possible via config changes.
Q10Is it urgent? (Priority Suggestion)
🔥 **Urgency**: **CRITICAL**. High severity, unauthenticated, active exploitation, and widespread exposure (>5k instances). **Patch immediately** to prevent server compromise.