How severe is CVE-2025-65403?

CVE-2025-65403 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-65403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65403?

CVE-2025-65403 affects Hfiref0x Lightftp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-65403 have an EU (EUVD) identifier?

Yes. CVE-2025-65403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200022.

When was CVE-2025-65403 published?

CVE-2025-65403 was published on 2025-12-01 and last updated on 2026-06-17.

CVE-2025-65403

CVE-2025-65403 is a medium-severity vulnerability in Hfiref0x Lightftp with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-200022
Weakness: CWE-120
Affected product: Hfiref0x Lightftp
Published: 2025-12-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-65403?: CVE-2025-65403 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-65403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65403?: CVE-2025-65403 affects Hfiref0x Lightftp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-65403 have an EU (EUVD) identifier?: Yes. CVE-2025-65403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200022.
When was CVE-2025-65403 published?: CVE-2025-65403 was published on 2025-12-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hfiref0x:lightftp:2.0:*:*:*:*:*:*:*

More vulnerabilities in Hfiref0x Lightftp

CVE-2017-1000218 — Critical (CVSS 9.8): LightFTP version 1.1 is vulnerable to a buffer overflow in the "writelogentry" function resulting a denial of services…
CVE-2023-24042 — High (CVSS 7.5): A race condition in LightFTP through 2.2 allows an attacker to achieve path traversal via a malformed FTP request. A…

All CVEs affecting Hfiref0x Lightftp →

Other CWE-120 (Classic Buffer Overflow) vulnerabilities

CVE-2025-48611 — Critical (CVSS 10.0): In DeviceId of DeviceId.java, there is a possible desync in persistence due to a missing bounds check. This could lead…
CVE-2026-24823 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in FASTSHIFT…
CVE-2026-24810 — Critical (CVSS 10.0): Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in rethinkdb (src/cjson modules).…
CVE-2026-24800 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in tildearrow…
CVE-2025-9962 — Critical (CVSS 10.0): A buffer overflow vulnerability in Novakon P series allows attackers to gain root permission without prior…
CVE-2010-10016 — Critical (CVSS 10.0): BS.Player version 2.57 (build 1051) contains a vulnerability in its playlist import functionality. When processing .m3u…

Browse all CWE-120 (Classic Buffer Overflow) vulnerabilities →