CVE-2025-47812: Wing FTP Server Improper Neutralization of Null Byte or NUL Character Vulnerability

Critical severity, CVSS 10.0. Actively exploited: in CISA KEV since 2025-07-14. EPSS: 93.2% chance of exploitation in the next 30 days.

In Wing FTP Server before 7.4.4. the user and admin web interfaces mishandle '\0' bytes, ultimately allowing injection of arbitrary Lua code into user session files. This can be used to execute arbitrary system commands with the privileges of the FTP service (root or SYSTEM by default). This is thus a remote code execution vulnerability that guarantees a total server compromise. This is also exploitable via anonymous FTP accounts.

Affected products

• Wftpserver Wing FTP Server: before 7.4.4 (fixed in 7.4.4)

Published 2025-07-10. Last modified 2026-06-17.