What is CVE-2025-65403?

CVE-2025-65403 is a medium-severity vulnerability in Hfiref0x Lightftp, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2025-12-01.

How severe is CVE-2025-65403?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Hfiref0x Lightftp

CVE-2025-65403

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.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (20.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Hfiref0x Lightftp — versions 2.0
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Exploit, Third Party Advisory)
cve@mitre.org (Product)

Frequently asked questions

What is CVE-2025-65403?: CVE-2025-65403 is a medium-severity vulnerability in Hfiref0x Lightftp, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2025-12-01.
How severe is CVE-2025-65403?: Medium severity. CVSS v3 base score is 6.5 out of 10.