CVE-2026-67192
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk46th percentile - higher than 46% of all known CVEs
Summary
Xlight FTP Server before version 3.9.5 contains a pre-authentication stack buffer overflow vulnerability. An unauthenticated attacker can send malformed SSH packets with GCM cipher negotiation, leading to stack corruption and potentially remote code execution.
Risk Assessment
An attacker can remotely execute code on the server without authentication, leading to full system compromise.
Recommendation
Update Xlight FTP Server to version 3.9.5 or later.
Other vulnerabilities in Xlight FTP Server
See all- CVE-2026-67191Critical
Xlight FTP Server before version 3.9.5 has a pre-authentication heap buffer overflow vulnerability. A remote unauthenticated attacker can send a malformed SSH client identification string to write past the end of a heap buffer. A logic error in the recv loop enables exploitation before authentication.
- CVE-2026-67193Medium
Xlight FTP Server before version 3.9.5 discloses the GetTickCount() value to unauthenticated attackers by sending a USER command with a username ending in :adm. Attackers can trigger the admin protocol path within the standard FTP listener pre-authentication, leaking timing information from the FTP 331 response.
- CVE-2019-25681High
Xlight FTP Server 3.9.1 has an SEH overwrite vulnerability allowing local attackers to crash the application and overwrite SEH pointers via a crafted 428-byte payload in the program execution field of virtual server configuration.
Original NVD description (English source)
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.