CVE-2025-5549
📋 TL;DR
CVE-2025-5549 is a critical buffer overflow vulnerability in FreeFloat FTP Server 1.0's PASV 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 in the FTP server context.
If Mitigated
If properly segmented and monitored, impact limited to FTP service disruption without lateral movement.
🎯 Exploit Status
Exploit code is publicly available and requires minimal technical skill to execute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch exists. Replace FreeFloat FTP Server 1.0 with a maintained alternative.
🔧 Temporary Workarounds
Disable PASV mode
windowsConfigure FreeFloat FTP Server to use only PORT mode instead of PASV mode
Edit FreeFloat configuration to disable PASV support
Network segmentation
allRestrict FTP server access to trusted networks only
Configure firewall rules to limit FTP port (21) access
🧯 If You Can't Patch
- Immediately isolate the FTP server from internet access
- Implement strict network monitoring for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server 1.0 is installed and running on port 21Check Version:
Check program files or registry for FreeFloat FTP Server version informationVerify Fix Applied:
Verify FreeFloat FTP Server 1.0 has been removed or replaced with alternative software📡 Detection & Monitoring
Log Indicators:
- Multiple failed PASV command attempts
- Unusual buffer overflow error messages in FTP logs
Network Indicators:
- Malformed PASV commands with excessive data length
- Exploit pattern traffic to FTP port 21
SIEM Query:
source="ftp.log" AND ("PASV" AND "buffer" OR "overflow")