CVE-2025-5551 in FTP Server
Summary
by MITRE • 06/04/2025
A vulnerability was found in FreeFloat FTP Server 1.0. It has been classified as critical. This affects an unknown part of the component SYSTEM Command Handler. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 06/24/2025
The vulnerability identified as CVE-2025-5551 represents a critical buffer overflow flaw within the FreeFloat FTP Server version 1.0, specifically within the SYSTEM Command Handler component. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which encompasses buffer overflow conditions that occur when more data is written to a buffer than it can hold, potentially leading to memory corruption and arbitrary code execution. The affected system component processes commands related to system-level operations, making it a prime target for exploitation. The vulnerability's classification as critical indicates the severe impact potential, particularly given that the attack can be initiated remotely without requiring local system access or authentication.
The technical exploitation of this buffer overflow vulnerability occurs when malicious input is sent to the SYSTEM Command Handler through FTP protocol communications. The flaw allows attackers to overflow the allocated buffer space and overwrite adjacent memory locations, potentially enabling them to execute arbitrary code with the privileges of the FTP server process. This remote exploitation capability significantly broadens the attack surface and makes the vulnerability particularly dangerous for networked systems. The public disclosure of exploit details further compounds the risk, as malicious actors can immediately leverage this knowledge to compromise affected systems without requiring advanced technical skills or extensive reconnaissance.
The operational impact of CVE-2025-5551 extends beyond simple system compromise, as it can lead to complete system takeover and persistent access for attackers. When exploited successfully, this vulnerability allows adversaries to gain unauthorized control over the FTP server, potentially enabling them to establish backdoors, exfiltrate sensitive data, or use the compromised system as a launch point for further attacks within the network. The implications are particularly severe for organizations relying on FreeFloat FTP Server for file transfer operations, as these systems often contain sensitive corporate or personal data. The vulnerability's potential for remote code execution aligns with ATT&CK technique T1059.001, which covers command and scripting interpreter usage, and T1078.004, which involves valid accounts for lateral movement.
Organizations must implement immediate mitigation strategies to protect against this vulnerability, including applying vendor-provided patches or updates, disabling unnecessary FTP services, and implementing network segmentation to limit access to affected systems. The recommended approach involves conducting comprehensive vulnerability assessments to identify all instances of FreeFloat FTP Server 1.0 within the network infrastructure, followed by mandatory system updates or replacements. Network monitoring should be enhanced to detect suspicious FTP protocol communications that may indicate exploitation attempts. Additionally, system administrators should consider implementing firewall rules that restrict FTP access to trusted networks only, and establish robust incident response procedures to quickly address any potential compromise attempts. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software and implementing defense-in-depth strategies to protect against known exploits that have been publicly disclosed.