CVE-2025-47812
Wing FTP Server Improper Neutralization of Null Byte or NUL Character Vulnerability
Wing FTP Server Wing FTP Server
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 14 July 2025. US federal agencies were required to remediate it by 4 August 2025.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 93.9%, which is higher than 99.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Frequently asked questions
Is CVE-2025-47812 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-47812.
What does CVE-2025-47812 affect?
CVE-2025-47812 affects Wing FTP Server Wing FTP Server. 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.
How severe is CVE-2025-47812?
CVE-2025-47812 is rated CRITICAL with a CVSS base score of 10. EPSS puts the probability of exploitation in the next 30 days at 93.9%, higher than 99.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 4 August 2025.
How should organisations respond to CVE-2025-47812?
Apply the vendor patch for Wing FTP Server Wing FTP Server as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.