VulnerabilityPublished 5 Jun 2025

CVE-2025-5637: PCMan FTP Server · Buffer Overflow

Affects PCMan FTP ServerSource CVE Database V5

Not known to be exploited · CVSS 6.9 Medium.

Data as of 26 Oct 2026, 10:12 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 26 Oct 2026.

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 or the CVSS exploit maturity 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
PCMan FTP Server	Affected =2.0.7	Fixed in–

AI-suggested

Immediate mitigation should include restricting external network access to PCMan FTP Server instances, ideally limiting connections to trusted internal IP ranges or VPNs.
Employ network-level intrusion detection and prevention systems (IDS/IPS) with signatures or heuristics capable of detecting anomalous FTP SYSTEM command usage or buffer overflow attempts.
Disable or restrict the use of the SYSTEM command handler if possible, or configure the FTP server to reject SYSTEM commands from untrusted sources.
Monitor FTP server logs for unusual or malformed commands indicative of exploitation attempts.
If feasible, replace PCMan FTP Server 2.0.7 with a more secure, actively maintained FTP server solution until an official patch is released.
Implement strict network segmentation to isolate FTP servers from critical infrastructure and sensitive data stores.
Maintain up-to-date backups of FTP server configurations and data to enable rapid recovery in case of compromise.
Educate IT staff to recognize exploitation signs and respond promptly to alerts related to this vulnerability.
Follow vendor communications closely for patch releases or official mitigation guidance and apply updates immediately upon availability.

Description

A vulnerability, which was classified as critical, was found in PCMan FTP Server 2.0.7. Affected is an unknown function of the component SYSTEM 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.

Impact

For European organizations, exploitation of this vulnerability could lead to unauthorized remote code execution or denial of service on systems running PCMan FTP Server 2.0.7. This could result in disruption of file transfer services, potential data exposure, or compromise of the underlying system integrity. Organizations relying on this FTP server for critical file exchange, especially those in sectors like manufacturing, logistics, or SMBs that commonly use lightweight FTP solutions, could face operational downtime and data integrity issues. Although the CVSS impact metrics are low, the ability to execute arbitrary commands remotely without authentication elevates the risk of lateral movement or further network compromise if attackers leverage this vulnerability as an initial foothold. Additionally, given the public disclosure of exploit code, European entities may experience increased targeted scanning and exploitation attempts. The absence of patches means that affected organizations must rely on network-level protections and configuration changes to mitigate risk, which may not fully prevent exploitation. The impact is heightened in environments where FTP servers are exposed to the internet or untrusted networks without adequate segmentation or monitoring.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 7 Jul 2025, 04:24 UTC

Technical details

References

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