CVE-2025-3727
📋 TL;DR
A critical buffer overflow vulnerability in PCMan FTP Server 2.0.7 allows remote attackers to execute arbitrary code or crash the service by sending specially crafted STATUS commands. This affects all systems running the vulnerable FTP server version. Attackers can exploit this without authentication from anywhere on the network.
💻 Affected Systems
- PCMan FTP Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, and lateral movement within the network.
Likely Case
Service crash causing denial of service, with potential for remote code execution by skilled attackers.
If Mitigated
Service disruption only if exploit attempts are blocked by network controls or the server is patched.
🎯 Exploit Status
Public exploit code is available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch exists. Consider upgrading to a different FTP server solution or implementing workarounds.
🔧 Temporary Workarounds
Disable FTP Service
windowsStop and disable the PCMan FTP Server service
sc stop "PCMan FTP Server"
sc config "PCMan FTP Server" start= disabled
Block FTP Port at Firewall
windowsBlock incoming connections to FTP port (default 21)
netsh advfirewall firewall add rule name="Block FTP" dir=in action=block protocol=TCP localport=21
🧯 If You Can't Patch
- Implement network segmentation to isolate FTP server from critical systems
- Deploy intrusion prevention system (IPS) rules to detect and block STATUS command exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if PCMan FTP Server 2.0.7 is installed and running on port 21Check Version:
Check program files directory for PCMan FTP Server version or review installed programs listVerify Fix Applied:
Verify service is stopped/disabled or replaced with alternative FTP server📡 Detection & Monitoring
Log Indicators:
- Multiple failed STATUS commands
- FTP service crash logs
- Unusual network traffic to FTP port
Network Indicators:
- Excessive STATUS commands to FTP server
- Malformed FTP packets
- Traffic patterns matching known exploit
SIEM Query:
source="ftp.log" AND (command="STATUS" AND length>1000) OR (event="service_crash" AND service="PCMan FTP")