CVE-2025-5356 in FTP Server
Summary
by MITRE • 05/30/2025
A vulnerability was found in FreeFloat FTP Server 1.0. It has been classified as critical. Affected is an unknown function of the component BYE Command Handler. The manipulation leads to buffer overflow. It is possible to launch 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-2025-5356 represents a critical buffer overflow flaw within the FreeFloat FTP Server version 1.0, specifically within the BYE command handler component. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which encompasses buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The affected BYE command handler processes client disconnection requests, making it a prime target for exploitation during normal FTP session termination procedures.
Remote exploitation capabilities of this vulnerability pose significant risks to systems running the affected FTP server software. Attackers can craft malicious BYE commands that exceed the allocated buffer space, potentially causing stack corruption and arbitrary code execution. The public disclosure of exploitation techniques means that threat actors can readily leverage this vulnerability without requiring advanced technical skills or specialized tools. This accessibility significantly amplifies the potential impact across various network environments where vulnerable FTP servers remain operational.
The operational impact of CVE-2025-5356 extends beyond simple system compromise, as successful exploitation can lead to complete system control, data exfiltration, and potential lateral movement within network infrastructures. The BYE command handler vulnerability creates a persistent attack surface that remains active throughout FTP server operation, providing attackers with continuous opportunities for exploitation. Organizations utilizing FreeFloat FTP Server 1.0 face immediate risk of unauthorized access and system compromise, particularly in environments where FTP services are exposed to untrusted networks or where administrative privileges are not properly restricted.
Mitigation strategies for this vulnerability require immediate action including deployment of vendor patches or updates, implementation of network segmentation to limit exposure, and disabling unnecessary FTP services. Security teams should consider implementing intrusion detection systems to monitor for exploitation attempts and establish network-based controls to restrict FTP traffic to trusted sources only. The ATT&CK framework categorizes this vulnerability under T1190 for Exploit Public-Facing Application, highlighting the need for comprehensive application security controls and regular vulnerability assessments to prevent similar issues from compromising organizational security postures. Organizations must also conduct thorough inventory assessments to identify all instances of FreeFloat FTP Server 1.0 and ensure complete remediation across their entire infrastructure.