CVE-2025-65403 Memory corruption in n/a

Medium 6.5 Published 1 Dec 2025 Updated 1 Dec 2025

Attackers can cause a Denial of Service in LightFTP via a buffer overflow in the MaxUsers component.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-65403?

CVE-2025-65403 is a medium-severity memory corruption vulnerability in n/a, published on 1 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-120

Which versions are affected by CVE-2025-65403?

It affects 1 product.

Products include Hfiref0x Lightftp.

How do I fix CVE-2025-65403?

No fix has been published for CVE-2025-65403 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-65403 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-65403 exists.

Sources

Also known as GHSA-2h9h-pcw6-4f34.