# Wing FTP Server: Improper Neutralization of Null Byte or NUL Character Vulnerability · pwn.watch

> Wing FTP Server contains an improper neutralization of null byte or NUL character vulnerability that can allow 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). Added to CISA KEV on 2025-07-14.

Page: https://pwn.watch/i/wing-ftp-server-cve-2025-47812 · generated 2026-10-22T20:45:43.249Z

## Status
- Severity: critical · status: closed · patch: patched
- Product: Wing FTP Server
- Started: 2025-07-14 · closed: 2025-07-14
- CVEs: CVE-2025-47812
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/wing-ftp-server-cve-2025-47812/feed.xml
- JSON Feed: https://pwn.watch/i/wing-ftp-server-cve-2025-47812/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/wing-ftp-server-cve-2025-47812.json
- This file: https://pwn.watch/i/wing-ftp-server-cve-2025-47812/llms.txt

## Updates (newest first)
- 2025-07-14: CISA added CVE-2025-47812 to the KEV catalog (due 2025-08-04).

## Fix brief
# Security brief: Wing FTP Server: Improper Neutralization of Null Byte or NUL Character Vulnerability

Source: https://pwn.watch/i/wing-ftp-server-cve-2025-47812 · status: closed (closed Jul 14, 2025) · severity: critical · updated Jul 14, 2025

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
Wing FTP Server contains an improper neutralization of null byte or NUL character vulnerability that can allow 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). Added to CISA KEV on 2025-07-14.

Severity detail: CVSS 10.0 (CNA, v3.1); actively exploited (CISA KEV)

- Product: Wing FTP Server
- CVE / advisory ids: CVE-2025-47812

## Affected versions
- See vendor advisory / CISA notes (versions not always listed in KEV feed)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- Jul 14, 2025: CISA added CVE-2025-47812 to the KEV catalog (due 2025-08-04).

## Advisories
- [Wing FTP Server advisory: Wing FTP Server](https://www.wftpserver.com/serverhistory.htm) (Wing FTP Server)
- [NVD: CVE-2025-47812](https://nvd.nist.gov/vuln/detail/CVE-2025-47812) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

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Machine-readable: https://pwn.watch/i/wing-ftp-server-cve-2025-47812.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.