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CVE-2026-67193— Xlight FTP Server < 3.9.5 Information Disclosure via USER Command

Quick assessment

Affected
Xlight Xlight FTP Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

xlight ftp server是xlight ftp server个人开发者的一款轻量级FTP服务器软件。 Xlight FTP Server 3.9.5之前版本存在侧信道信息泄露漏洞，该漏洞源于发送USER命令以:adm结尾触发admin协议路径，导致未经身份验证的攻击者泄露GetTickCount()值。

CVSS 5.3 · Medium EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xlight Xlight FTP Server < 3.9.5 affected
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I. Basic Information for CVE-2026-67193

Vulnerability Information
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Vulnerability Title
Xlight FTP Server < 3.9.5 Information Disclosure via USER Command
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
xlight ftp server 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xlight ftp server是xlight ftp server个人开发者的一款轻量级FTP服务器软件。 Xlight FTP Server 3.9.5之前版本存在侧信道信息泄露漏洞，该漏洞源于发送USER命令以:adm结尾触发admin协议路径，导致未经身份验证的攻击者泄露GetTickCount()值。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xlight Xlight FTP Server 0 ~ 3.9.5 -

II. Public POCs for CVE-2026-67193

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III. Intelligence Information for CVE-2026-67193

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Vendor Advisories for CVE-2026-67193 (1)

Vendor Pages for CVE-2026-67193 (1)

Same Patch Batch · Xlight · 2026-07-29 · 3 CVEs total

CVE-2026-67191 9.8 CRITICAL Xlight FTP Server < 3.9.5 Pre-Auth Heap Buffer Overflow via SSH Parser
CVE-2026-67192 8.1 HIGH Xlight FTP Server < 3.9.5 Pre-Auth Stack Buffer Overflow via SSH GCM Cipher

IV. Related Vulnerabilities

Same product: Xlight FTP Server
Same vendor: Xlight
Same weakness: CWE-203

V. Comments for CVE-2026-67193

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