The server lacks thread safety and can be crashed by anomalous data sent by an anonymous user from a remote network. The crash causes the FTP service to become unavailable, affecting all users and processes that rely on it for file transfers. If the crash occurs during file upload or download, it could lead to incomplete file transfers, potentially corrupting data. The repeated crash might also affect the stability of the underlying system, especially if it leads to resource leaks or affects other services.

A vulnerability classified as problematic was found in Xlightftpd Xlight FTP Server 1.1. This vulnerability affects unknown code of the component Login. The manipulation of the argument user leads to denial of service. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-251560.

A race condition in LightFTP through 2.2 allows an attacker to achieve path traversal via a malformed FTP request. A handler thread can use an overwritten context->FileName.

Xlight FTP v3.9.3.2 was discovered to contain a stack-based buffer overflow which allows attackers to leak sensitive information via crafted code.

LightFTP version 1.1 is vulnerable to a buffer overflow in the "writelogentry" function resulting a denial of services or a remote code execution.

Directory traversal vulnerability in the SFTP/SSH2 virtual server in Xlight FTP Server 3.5.0, 3.5.5, and possibly other versions before 3.6 allows remote authenticated users to read, overwrite, or delete arbitrary files via .. (dot dot) sequences in the (1) ls, (2) rm, (3) rename, and other unspecified commands.

Multiple SQL injection vulnerabilities in Xlight FTP Server before 3.2.1, when ODBC authentication is enabled, allow remote attackers to execute arbitrary SQL commands via the (1) USER (aka username) or (2) PASS (aka password) command.