CVE-2026-67193

MEDIUM 5.3

Xlight FTP Server < 3.9.5 Information Disclosure via USER Command

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-203
Vendor	xlight
Product	xlight ftp server
Published	Jul 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

Xlight / Xlight FTP Server

0 < 3.9.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

McCaulay Hudson (@_McCaulay) of watchTowr