CVE-2025-5076
📋 TL;DR
CVE-2025-5076 is a critical buffer overflow vulnerability in FreeFloat FTP Server 1.0's SEND 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, and persistent backdoor installation.
Likely Case
Service crash causing denial of service, with potential for remote code execution by skilled attackers.
If Mitigated
Service disruption but limited lateral movement if proper network segmentation and least privilege are implemented.
🎯 Exploit Status
Public exploit code is available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch is available. Consider migrating to a supported FTP server solution.
🔧 Temporary Workarounds
Disable FreeFloat FTP Server
windowsStop and disable the FreeFloat FTP Server service to prevent exploitation.
sc stop FreeFloatFTPServer
sc config FreeFloatFTPServer start= disabled
Network Access Control
windowsRestrict network access to the FTP server using firewall rules.
netsh advfirewall firewall add rule name="Block FreeFloat FTP" dir=in action=block protocol=TCP localport=21
🧯 If You Can't Patch
- Replace FreeFloat FTP Server with a supported alternative like FileZilla Server, vsftpd, or ProFTPD.
- Implement strict network segmentation and firewall rules to limit access to the vulnerable server.
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server 1.0 is installed and running on the system.Check Version:
Check installed programs in Control Panel or run: wmic product get name,version | findstr /i freefloatVerify Fix Applied:
Verify the service is stopped/disabled or that the software has been removed.📡 Detection & Monitoring
Log Indicators:
- Multiple failed SEND command attempts
- Unusual buffer overflow errors in FTP logs
- Service crash events in Windows Event Log
Network Indicators:
- Excessive SEND commands with large payloads
- Traffic patterns indicating buffer overflow attempts
SIEM Query:
source="ftp.log" AND (command="SEND" AND size>threshold) OR (event_id=1000 AND process_name="FreeFloatFTPServer.exe")