CVE-2025-3762
📋 TL;DR
CVE-2025-3762 is a critical buffer overflow vulnerability in PCMan FTP Server 2.0.7's MPUT command handler that allows remote attackers to execute arbitrary code or crash the service. The vulnerability affects all systems running the vulnerable FTP server version. Attackers can exploit this without authentication over 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, or ransomware deployment.
Likely Case
Service disruption through denial of service, with potential for remote code execution by skilled attackers.
If Mitigated
Limited to service disruption if proper network segmentation and exploit prevention controls are in place.
🎯 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 available. Consider migrating to alternative FTP server software or implementing workarounds.
🔧 Temporary Workarounds
Disable MPUT Command
windowsConfigure FTP server to reject or disable MPUT commands if possible
Check server configuration documentation for command filtering options
Network Access Control
windowsRestrict FTP server access to trusted IP addresses only
Use Windows Firewall: netsh advfirewall firewall add rule name="Restrict FTP" dir=in action=allow protocol=TCP localport=21 remoteip=192.168.1.0/24
🧯 If You Can't Patch
- Isolate the FTP server in a dedicated network segment with strict egress filtering
- Implement application-level firewall or WAF rules to block suspicious MPUT command patterns
🔍 How to Verify
Check if Vulnerable:
Check PCMan FTP Server version in the application interface or About dialog. Version 2.0.7 is vulnerable.Check Version:
Check application interface or registry: HKEY_LOCAL_MACHINE\SOFTWARE\PCMan\FTP Server\VersionVerify Fix Applied:
Verify server is no longer running version 2.0.7 or has been replaced with alternative software.📡 Detection & Monitoring
Log Indicators:
- Multiple failed MPUT commands
- Unusually large MPUT command parameters
- Server crash/restart events
Network Indicators:
- Excessive data in FTP MPUT commands
- Patterns matching known exploit payloads in FTP traffic
SIEM Query:
source="ftp_server.log" AND (command="MPUT" AND (data_length>1000 OR contains(pattern="\x90\x90\x90")))