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Varaxon Technologies

Known exploited vulnerability · CISA KEV

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

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).

CVE-2025-47812

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2025-07-14: attackers are using it right now.

CISA KEV
Listed
Added 2025-07-14 · federal fix-by 2025-08-04
EPSS (30 days)
94%
Higher than 99.8% of CVEs · 2026-11-01
CVSS
No score

What CISA says

Wing FTP Server Improper Neutralization of Null Byte or NUL Character Vulnerability

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Got a whole scan? Scan Hub runs this check on every finding in your Nessus, Qualys, Rapid7 or OpenVAS export and ranks the report by it.

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How to check if you are exposed to CVE-2025-47812

  1. Find every Wing FTP Server system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2025-47812.

US federal agencies had to fix this by 2025-08-04. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

  1. · Added to CISA's Known Exploited Vulnerabilities catalog
  2. · Fix-by date for US federal agencies, passed 454 days ago

Vendor advisories and fixes

Weakness type

More exploited Wing FTP Server vulnerabilities

CISA lists 2 exploited Wing FTP Server vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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