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

EPSS: 0.004 (31.4th percentile) — read the EPSS interpretation.

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.

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

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (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.