What is the CVSS score of CVE-2025-65403?

CVE-2025-65403 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Lightftp are affected by CVE-2025-65403?

Organizations using the g_cfg.MaxUsers component of LightFTP should be aware of notable risk from CVE-2025-65403, a buffer overflow vulnerability rated CVSS 6.5.

Is there a public PoC exploit available for CVE-2025-65403?

Yes, a public proof-of-concept exploit is available for CVE-2025-65403. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-65403?

Within 30 days: Identify affected systems running the g_cfg.MaxUsers component of LightFTP and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Lightftp CVE-2025-65403

EUVD-2025-200022 MEDIUM

Classic Buffer Overflow (CWE-120)

2025-12-01 cve@mitre.org

Denial Of Service Buffer Overflow Lightftp

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 15, 2026 - 13:34 euvd

EUVD-2025-200022

Analysis Generated

Mar 15, 2026 - 13:34 vuln.today

PoC Detected

Dec 05, 2025 - 21:50 vuln.today

Public exploit code

CVE Published

Dec 01, 2025 - 16:15 nvd

MEDIUM 6.5

DescriptionCVE.org

A buffer overflow in the g_cfg.MaxUsers component of LightFTP v2.0 allows attackers to cause a Denial of Service (DoS) via a crafted input.

Analysis

A buffer overflow in the g_cfg.MaxUsers component of LightFTP v2.0 allows attackers to cause a Denial of Service (DoS) via a crafted input.

Technical ContextAI

A buffer overflow occurs when data written to a buffer exceeds its allocated size, potentially overwriting adjacent memory and corrupting program state. This vulnerability is classified as Classic Buffer Overflow (CWE-120).

RemediationAI

Use memory-safe languages or bounds-checked functions. Enable ASLR, DEP/NX, and stack canaries. Apply vendor patches promptly.

CVE-2025-65403 vulnerability details – vuln.today

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Lightftp CVE-2025-65403

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

Analysis

Technical ContextAI

RemediationAI

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External POC / Exploit Code