Wing FTP Server - RCE (CVE-2025-47812)

CVE-2025-47812 is a critical remote code execution vulnerability in Wing FTP Server prior to version 7.4.4, where improper handling of null bytes in the web interfaces allows attackers to inject arbitrary Lua code into session files. Exploitation of this flaw can lead to execution of system commands with root or SYSTEM privileges, resulting in complete server compromise, and can even be triggered via anonymous FTP accounts.

CrowdSec has been tracking this vulnerability and its exploits since 16th of July 2025.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2025-47812 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2025-47812. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.

Attackers exploit this vulnerability by sending a POST request to /loginok.html with a maliciously crafted username, enabling remote code execution on vulnerable Wing FTP Server instances.