CVE-2025-5595
📋 TL;DR
CVE-2025-5595 is a critical buffer overflow vulnerability in FreeFloat FTP Server 1.0's PROGRESS command handler that allows remote attackers to execute arbitrary code or crash the service. This affects all deployments of FreeFloat FTP Server 1.0. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- FreeFloat FTP Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Service disruption through denial of service (crash) or limited code execution for foothold establishment.
If Mitigated
If network segmentation and strict firewall rules are in place, impact is limited to the FTP service itself.
🎯 Exploit Status
Public exploit code is available, making exploitation trivial for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch exists. Consider migrating to a supported FTP server solution.
🔧 Temporary Workarounds
Network Segmentation and Firewall Rules
windowsBlock external access to FreeFloat FTP Server ports (default TCP 21) and restrict internal access to trusted IPs only.
netsh advfirewall firewall add rule name="Block FreeFloat FTP" dir=in action=block protocol=TCP localport=21
Disable FreeFloat FTP Service
windowsStop and disable the FreeFloat FTP Server service to prevent exploitation.
sc stop FreeFloatFTPServer
sc config FreeFloatFTPServer start= disabled
🧯 If You Can't Patch
- Replace FreeFloat FTP Server with a maintained alternative like FileZilla Server, vsftpd, or ProFTPD
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server 1.0 is installed and running on the system.Check Version:
Check Windows Services for 'FreeFloat FTP Server' or examine installed programs in Control PanelVerify Fix Applied:
Verify the service is stopped/disabled or replaced with alternative software.📡 Detection & Monitoring
Log Indicators:
- Multiple failed connection attempts to FTP port
- Unusual PROGRESS command usage patterns
- Service crash events in Windows Event Log
Network Indicators:
- Unusual traffic to FTP port 21 from untrusted sources
- Buffer overflow patterns in FTP protocol traffic
SIEM Query:
source="windows" AND (event_id=7036 AND service_name="FreeFloat FTP Server") OR (event_id=4625 AND destination_port=21)