CVE-2025-47812

Published Jul 10, 2025

Last updated 6 months ago

Exploit known CVSS critical 10.0

Wing FTP Server

FTP

Port (21)

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-47812 is a remote code execution vulnerability in Wing FTP Server. The vulnerability arises because the application doesn't properly handle NULL bytes in usernames. By appending a NULL byte to the username, an attacker can bypass authentication and inject Lua code into session files. Specifically, when a user authenticates with a NULL-byte injected username, the server creates a new session ID and stores the NULL byte in the session variable. This allows an attacker to inject arbitrary Lua code, leading to remote code execution with root privileges on Linux systems and SYSTEM rights on Windows systems because the wftpserver runs with elevated privileges by default.

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.
Source: cve@mitre.org
NVD status: Analyzed
Products: wing_ftp_server

Risk scores

CVSS 3.1

Type: Secondary
Base score: 10
Impact score: 6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: Wing FTP Server Improper Neutralization of Null Byte or NUL Character Vulnerability
Exploit added on: Jul 14, 2025
Exploit action due: Aug 4, 2025
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Weaknesses

cve@mitre.org: CWE-158

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:wftpserver:wing_ftp_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "34AF9E83-291C-40B0-AE69-34C9B59A5D03",
            "versionEndExcluding": "7.4.4",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.