PT-2026-65837 · Xlight · Xlight Ftp Server

CVE-2026-67192 · Published 2026-07-29 · Updated 2026-07-29

Mitre

CVSS v3.1

8.1

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-67192

Affected Products

Xlight Ftp Server

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-67192 · Security Note
• https://vulncheck.com/advisories/xlight-ftp-server-pre-auth-stack-buffer-overflow-via-ssh-gcm-cipher · Note
• https://xlightftpd.com/whatsnew.htm · Note