CVE-2025-5052
📋 TL;DR
A critical buffer overflow vulnerability in FreeFloat FTP Server 1.0's LS command handler 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 crash causing denial of service, potentially followed by remote code execution.
If Mitigated
Service crash only if exploit fails, but system remains vulnerable to retries.
🎯 Exploit Status
Public exploit code exists, making weaponization trivial. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch exists. FreeFloat FTP Server appears to be abandoned software. Immediate migration to alternative FTP server software is required.
🔧 Temporary Workarounds
Disable LS command via firewall
allBlock FTP commands at network level to prevent exploitation
Use firewall rules to block FTP command traffic to port 21
Network segmentation
allIsolate FreeFloat FTP Server from critical networks
Configure VLANs or firewall rules to restrict access
🧯 If You Can't Patch
- Immediately disable or uninstall FreeFloat FTP Server 1.0
- Migrate to maintained FTP server software like FileZilla Server, vsftpd, or ProFTPD
🔍 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 installation directory for version informationVerify Fix Applied:
Verify FreeFloat FTP Server is no longer installed or running📡 Detection & Monitoring
Log Indicators:
- Multiple failed LS commands
- Unusually long LS command parameters
- Service crash logs
Network Indicators:
- Excessive traffic to FTP port 21 with long command strings
- Buffer overflow patterns in packet captures
SIEM Query:
source="ftp.log" AND (command="LS" AND length>100) OR (event="crash" AND process="FreeFloat")