CVE-2025-5664VulnerabilityPublished 5 Jun 2025

CVE-2025-5664: FreeFloat FTP Server · Buffer Overflow

Affects FreeFloat FTP ServerSource CVE Database V5

Not known to be exploited · CVSS 6.9 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 5 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
FreeFloat FTP Server	Affected =1.0	Fixed in–

AI-suggested

1. Immediate mitigation should include disabling the FreeFloat FTP Server 1.0 service if it is not essential or replacing it with a modern, actively maintained FTP server software that has no known vulnerabilities. 2. If continued use is necessary, restrict network exposure by limiting FTP server access to trusted internal networks or VPNs, and block FTP ports (typically TCP 21) at the perimeter firewall to prevent unauthorized external access. 3. Implement network intrusion detection/prevention systems (IDS/IPS) with signatures or anomaly detection capable of identifying malformed FTP RESTART commands or buffer overflow attempts. 4. Monitor logs for unusual FTP activity, especially unexpected RESTART command usage or connection attempts from unknown sources. 5. Engage with the vendor or community to obtain patches or updates addressing this vulnerability as soon as they become available. 6. Consider deploying application-layer firewalls or FTP proxies that can sanitize or validate FTP commands to prevent malformed inputs from reaching the vulnerable server. 7. Conduct regular vulnerability scans and penetration tests focusing on legacy services to identify and remediate similar risks proactively.

Description

A vulnerability was found in FreeFloat FTP Server 1.0 and classified as critical. This issue affects some unknown processing of the component RESTART Command Handler. The manipulation leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Impact

For European organizations, this vulnerability poses a risk primarily to those still operating FreeFloat FTP Server 1.0, especially in legacy or industrial environments where FTP remains in use for file transfers. Exploitation could lead to service disruption, data breaches, or unauthorized system control, impacting business continuity and data confidentiality. Given the remote exploitability without authentication, attackers could scan for exposed FTP servers and attempt exploitation, potentially leading to lateral movement within networks. Critical infrastructure, manufacturing, and sectors relying on legacy FTP servers for operational technology data exchange could be particularly vulnerable. The medium CVSS score suggests moderate impact, but the actual risk depends on the prevalence of this FTP server in European networks. Organizations with exposed FTP services should consider the risk of targeted attacks or opportunistic scanning. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate it, especially as exploit code may emerge following public disclosure.

Summary

CVE-2025-5664 is a buffer overflow vulnerability identified in FreeFloat FTP Server version 1.0, specifically within the RESTART Command Handler component. The vulnerability arises from improper handling of input data related to the FTP RESTART command, which allows an attacker to send crafted requests that overflow a buffer in memory. This overflow can corrupt adjacent memory, potentially leading to arbitrary code execution or denial of service. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. Although the CVSS 4.0 base score is 6.9 (medium severity), the potential for remote exploitation and memory corruption makes it a significant concern. No known exploits are currently reported in the wild, and no patches have been published yet. The FreeFloat FTP Server 1.0 is an older FTP server product, and this vulnerability highlights the risks of legacy software components still in use. The lack of authentication or user interaction requirements means attackers can attempt exploitation directly over the network, targeting exposed FTP services running this version. The vulnerability affects confidentiality, integrity, and availability to a limited extent, as successful exploitation could allow attackers to execute arbitrary code or crash the server, disrupting service and potentially gaining unauthorized access.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 7 Jul 2025, 13:56 UTC

Technical details

References

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