What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-07-14
• EPSS: 93.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-07-10 · updated 2026-06-17
• Weakness: CWE-158

Description

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

• Wing FTP Server: before 7.4.4 — fixed in 7.4.4

How to fix

Upgrade to a fixed version: Wing FTP Server 7.4.4. Check the vendor advisory for mitigations.

References

• https://www.rcesecurity.com/2025/06/what-the-null-wing-ftp-server-rce-cve-2025-47812/
• https://www.vicarius.io/vsociety/posts/cve-2025-47812-detection-script-remote-code-execution-vulnerability-in-wing-ftp-server
• https://www.vicarius.io/vsociety/posts/cve-2025-47812-mitigation-script-remote-code-execution-vulnerability-in-wing-ftp-server
• https://www.wftpserver.com
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-47812
• https://www.huntress.com/blog/wing-ftp-server-remote-code-execution-cve-2025-47812-exploited-in-wild

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