Severe Vulnerability in Wing FTP Server (CVE-2025-47812) Under Active Exploitation
July 11, 2025
Cyber Attack / Vulnerability Alert
A recently uncovered critical security vulnerability affecting Wing FTP Server is currently being exploited, as reported by Huntress. Known as CVE-2025-47812 (CVSS score: 10.0), this flaw involves improper handling of null (‘\0’) bytes within the server’s web interface, leading to potential remote code execution. The issue has been resolved in version 7.4.4. According to CVE.org’s advisory, “The user and admin web interfaces mishandle ‘\0’ bytes, allowing for the injection of arbitrary Lua code into user session files.” This can enable the execution of arbitrary system commands with the privileges of the FTP service, which defaults to root or SYSTEM. Alarmingly, the vulnerability can also be exploited through anonymous FTP accounts. A detailed analysis of this security issue became public in late June 2025, thanks to RCE Security researcher Julien Ahrens.