CVE-2025-47812 — Wing FTP Server Improper Neutralization of Null Byte or NUL Character Vulnerabil
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 SY
Published
2025-07-10T00:00:00.000Z
Last modified
2026-02-26T17:50:49.802Z
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA KEV — Actively Exploited
01What is this vulnerability?
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…
02Affected products
| Vendor | Product | Versions |
|---|
| wftpserver | Wing FTP Server | 0 |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2025-07-14. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2025-07-10T00:00:00.000Z
- Last modified: 2026-02-26T17:50:49.802Z
- Added to CISA KEV: 2025-07-14
- BOD 22-01 due: 2025-08-04
09References
- www.wftpserver.com — https://www.wftpserver.com
- www.rcesecurity.com — https://www.rcesecurity.com/2025/06/what-the-null-wing-ftp-server-rce-cve-2025-4…
- www.vicarius.io — https://www.vicarius.io/vsociety/posts/cve-2025-47812-mitigation-script-remote-c…
- www.vicarius.io — https://www.vicarius.io/vsociety/posts/cve-2025-47812-detection-script-remote-co…
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