VulnerabilityPublished 5 Jun 2025

CVE-2025-5636: 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, 14:05 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 upgrade or patching: Organizations should monitor PCMan’s official channels for patches addressing this vulnerability and apply them promptly once available.
Network-level controls: Restrict access to FTP servers using firewalls or network segmentation to limit exposure to untrusted networks, especially the internet.
Disable or restrict the SET command: If possible, configure the FTP server to disable or restrict the SET command handler to prevent exploitation of the vulnerable component.
Implement intrusion detection/prevention systems (IDS/IPS): Deploy IDS/IPS solutions with updated signatures to detect and block attempts to exploit this buffer overflow.
Monitor logs and network traffic: Establish enhanced monitoring for unusual FTP commands or traffic patterns indicative of exploitation attempts.
Consider alternative secure file transfer protocols: Where feasible, migrate from FTP to more secure protocols such as SFTP or FTPS, which provide encryption and improved security controls.
Conduct vulnerability scanning: Regularly scan internal and external assets to identify instances of PCMan FTP Server 2.0.7 and verify remediation status. These measures go beyond generic advice by focusing on command-level restrictions, network segmentation, and proactive monitoring tailored to the nature of this vulnerability.

Description

A vulnerability, which was classified as critical, has been found in PCMan FTP Server 2.0.7. This issue affects some unknown processing of the component SET 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, the exploitation of CVE-2025-5636 could have significant consequences, especially for those relying on PCMan FTP Server 2.0.7 for file transfer services. Compromise of FTP servers can lead to unauthorized access to sensitive data, disruption of business operations, and potential footholds for further attacks within corporate networks. Given the FTP server’s role in data exchange, attackers could intercept or manipulate files, impacting data integrity and confidentiality. Additionally, the ability to execute arbitrary code remotely could allow attackers to deploy malware, ransomware, or establish persistent access. Organizations in sectors such as finance, manufacturing, and government, which often handle sensitive or regulated data, may face compliance violations and reputational damage if exploited. The medium severity rating suggests that while the vulnerability is serious, exploitation may require specific conditions or may not lead to full system compromise in all cases. However, the lack of authentication and user interaction requirements increases the risk of automated exploitation attempts, making timely mitigation critical.

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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