What is CVE-2023-22551?

CVE-2023-22551 is a high-severity vulnerability in FTP Project. CVSS score: 7.5/10. Published 2023-01-01.

How severe is CVE-2023-22551?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-22551 known to be exploited?

7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in FTP Project

CVE-2023-22551

The FTP (aka "Implementation of a simple FTP client and server") project through 96c1a35 allows remote attackers to cause a denial of service (memory consumption) by engaging in client activity, such as establishing and then terminating a connection. This occurs because malloc is used but free is not.

Published 2023-01-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

FTP Project

Public proof-of-concept exploits

References

github.com/rovinbhandari/FTP/issues/8 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2023-22551?: CVE-2023-22551 is a high-severity vulnerability in FTP Project. CVSS score: 7.5/10. Published 2023-01-01.
How severe is CVE-2023-22551?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-22551 known to be exploited?: 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.