CVE-2001-0296 in WFTPD
Summary
by MITRE
Buffer overflow in WFTPD Pro 3.00 allows remote attackers to execute arbitrary commands via a long CWD command.
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Analysis
by VulDB Data Team • 10/07/2025
The vulnerability identified as CVE-2001-0296 represents a critical buffer overflow flaw within WFTPD Pro version 3.00, a popular FTP server implementation that was widely deployed in enterprise and organizational environments during the early 2000s. This vulnerability specifically manifests in the handling of the CWD (Change Working Directory) command, which is a standard FTP command used to navigate between directories on the server filesystem. The flaw arises from inadequate input validation and bounds checking within the FTP server's command processing routine, creating a condition where maliciously crafted input can overwrite adjacent memory locations beyond the allocated buffer space. The vulnerability operates under CWE-121, which categorizes buffer overflow conditions where insufficient space allocation leads to memory corruption, and aligns with ATT&CK technique T1190 for exploitation of vulnerabilities in remote services.
The technical exploitation of this vulnerability enables remote attackers to execute arbitrary code on the affected system with the privileges of the FTP service account, typically running with elevated system permissions. When an attacker sends a specially crafted CWD command containing an excessively long string of characters, the buffer overflow occurs during command parsing, potentially overwriting the return address on the stack or other critical memory structures. This memory corruption can be leveraged to redirect program execution flow to malicious code injected by the attacker, effectively allowing complete system compromise. The vulnerability's impact extends beyond simple command execution as it can provide persistent access to the compromised system, enabling attackers to establish backdoors, escalate privileges, or use the system as a launching point for further attacks within the network infrastructure.
The operational impact of CVE-2001-0296 was significant given the widespread deployment of WFTPD Pro in corporate environments during the late 1990s and early 2000s, making it a prime target for exploitation by cybercriminals and nation-state actors alike. Organizations running this vulnerable FTP server were exposed to complete system compromise, data exfiltration, and potential lateral movement within their networks through the compromised FTP service. The vulnerability's remote exploitability meant that attackers could compromise systems without requiring physical access or local network presence, making it particularly dangerous for organizations with public FTP services. Security professionals and system administrators who failed to patch this vulnerability were left vulnerable to attacks that could result in unauthorized data access, system infiltration, and potential regulatory compliance violations under data protection regulations of the time.
Mitigation strategies for CVE-2001-0296 required immediate action through software patching and configuration hardening measures. The most effective remediation involved upgrading to a patched version of WFTPD Pro or migrating to alternative FTP server implementations that had addressed this buffer overflow vulnerability. Organizations should have implemented network segmentation to limit exposure of FTP services to trusted networks only, while also deploying intrusion detection systems to monitor for suspicious CWD command patterns. Additional defensive measures included configuring the FTP server to limit input command lengths, implementing strict access controls, and conducting regular security assessments of network services. The vulnerability also highlighted the importance of proper input validation and secure coding practices, reinforcing the need for developers to follow secure programming guidelines and perform thorough code reviews to prevent similar buffer overflow conditions in future software implementations.