What is CVE-2020-37155?

CVE-2020-37155 is a high-severity vulnerability in Core FTP Lite, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-02-07.

How severe is CVE-2020-37155?

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

Buffer overflow in Core FTP Lite

CVE-2020-37155

Core FTP Lite 1.3 contains a buffer overflow vulnerability in the username input field that allows attackers to crash the application by supplying oversized input. Attackers can generate a 7000-byte payload of repeated 'A' characters to trigger an application crash without requiring additional interaction.

Vulnerability class: Buffer Overflow

Published 2026-02-07 · 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: 0.004 (32.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Core FTP Lite — versions 1.3c Build 1437

Weakness classification (CWE)

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

References

www.exploit-db.com/exploits/48100 (exploit)
www.coreftp.com/ (product)
www.vulncheck.com/advisories/core-ftp-lite-denial-of-service-poc (third-party-advisory)

Frequently asked questions

What is CVE-2020-37155?: CVE-2020-37155 is a high-severity vulnerability in Core FTP Lite, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-02-07.
How severe is CVE-2020-37155?: High severity. CVSS v3 base score is 7.5 out of 10.