---
title: "CVE-2025-47812: Wing FTP Server Improper Neutralization of Null Byte or NUL Character Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-47812/
description: "CVE-2025-47812 (Wing FTP Server Wing FTP Server): Exploited in the wild (CISA KEV). In Wing FTP Server before 7.4.4. the user and admin web interfaces…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-07-10
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-47812"
kev: true
cvss: 10
epss: 0.93884
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Wing FTP Server Wing FTP Server. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-07-14, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-08-04 ; treat that as the outer limit, not the target.
- EPSS 93.9% , percentile 99.8: FIRST’s model estimates a 93.9% chance of exploitation activity in the next 30 days, higher than 99.8% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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 (CVE record)

- wftpserver Wing FTP Server: < 7.4.4

## Severity

- mitre CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-07-14; federal due date 2025-08-04. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 93.88% probability of exploitation activity in the next 30 days; percentile 99.8.

## Sources

- [Listed in CISA KEV notes (wftpserver.com)](https://www.wftpserver.com/serverhistory.htm)
- [CVE.org record CVE-2025-47812](https://www.cve.org/CVERecord?id=CVE-2025-47812)
- [NVD entry CVE-2025-47812](https://nvd.nist.gov/vuln/detail/CVE-2025-47812)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-47812)
- [wftpserver.com](https://www.wftpserver.com)
- [rcesecurity.com](https://www.rcesecurity.com/2025/06/what-the-null-wing-ftp-server-rce-cve-2025-47812/)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-47812-mitigation-script-remote-code-execution-vulnerability-in-wing-ftp-server)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-47812-detection-script-remote-code-execution-vulnerability-in-wing-ftp-server)
- [huntress.com](https://www.huntress.com/blog/wing-ftp-server-remote-code-execution-cve-2025-47812-exploited-in-wild)

---
Source page: https://erroneo.us/security/cve/CVE-2025-47812/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt