Xlight FTP Server before 3.9.5 contains a pre-authentication stack buffer overflow vulnerability that allows unauthenticated attackers to corrupt stack memory by sending malformed SSH packets when a GCM cipher is negotiated. Attackers can craft packets with an unvalidated length field passed directly to the GCM decrypt function, overwriting the stack cookie and return address to potentially achieve remote code execution before any authentication occurs.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 14 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:xlightftpd:xlight_ftp_server:*:*:*:*:*:*:*:*

Thu, 30 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Xlightftpd
Xlightftpd xlight Ftp Server
Vendors & Products Xlightftpd
Xlightftpd xlight Ftp Server

Wed, 29 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 29 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
Description Xlight FTP Server before 3.9.5 contains a pre-authentication stack buffer overflow vulnerability that allows unauthenticated attackers to corrupt stack memory by sending malformed SSH packets when a GCM cipher is negotiated. Attackers can craft packets with an unvalidated length field passed directly to the GCM decrypt function, overwriting the stack cookie and return address to potentially achieve remote code execution before any authentication occurs.
Title Xlight FTP Server < 3.9.5 Pre-Auth Stack Buffer Overflow via SSH GCM Cipher
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-14T16:50:48.055Z

Reserved: 2026-07-28T16:06:49.773Z

Link: CVE-2026-67192

cve-icon Vulnrichment

Updated: 2026-07-29T19:15:45.513Z

cve-icon NVD

Status : Deferred

Published: 2026-07-29T16:17:57.683

Modified: 2026-07-30T20:04:51.110

Link: CVE-2026-67192

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T13:15:05Z

Weaknesses