CVE-2025-3376 in FTP Server
Summary
by MITRE • 04/07/2025
A vulnerability was found in PCMan FTP Server 2.0.7. It has been declared as critical. This vulnerability affects unknown code of the component CONF Command Handler. The manipulation leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 05/30/2026
The PCMan FTP Server version 2.0.7 contains a critical buffer overflow vulnerability within its CONF Command Handler component that represents a significant security risk for affected systems. This vulnerability resides in the server's configuration command processing functionality where improper input validation occurs during command handling operations. The flaw allows attackers to manipulate the CONF command handler through specially crafted input sequences that exceed allocated buffer boundaries, potentially leading to arbitrary code execution or system compromise.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient boundary checking allows attackers to overwrite adjacent memory locations. The attack vector is remote, meaning that malicious actors can exploit this weakness without requiring physical access to the target system. The vulnerability's critical rating indicates that it can be easily exploited and has substantial impact on system security and availability. The public disclosure of exploitation techniques further amplifies the risk as threat actors can readily implement attack methods without requiring advanced technical skills.
From an operational perspective, this vulnerability poses severe consequences for organizations relying on PCMan FTP Server for file transfer operations. Attackers who successfully exploit this buffer overflow can gain unauthorized access to the server, potentially escalating privileges to execute malicious code with elevated system permissions. The impact extends beyond simple data theft as attackers may establish persistent backdoors, modify server configurations, or use the compromised system as a launch point for broader network attacks. The vulnerability affects the core functionality of the FTP server's configuration handling, which could lead to complete service disruption or unauthorized access to sensitive data stored on the server.
Mitigation strategies should prioritize immediate patching of the affected PCMan FTP Server version 2.0.7 to address the buffer overflow vulnerability in the CONF Command Handler. Organizations should implement network segmentation and firewall rules to restrict access to FTP services, limiting exposure to unauthorized users. Additional defensive measures include deploying intrusion detection systems to monitor for suspicious CONF command patterns and implementing strict input validation controls on all FTP server communications. The exploitation of this vulnerability demonstrates the importance of maintaining up-to-date software versions and conducting regular security assessments of network services. Organizations should also consider implementing application whitelisting policies and monitoring for anomalous FTP server behavior that could indicate exploitation attempts. The ATT&CK framework categorizes this vulnerability under initial access and execution phases, highlighting the need for comprehensive endpoint protection and network monitoring solutions to detect and prevent exploitation attempts.