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[ CVE-2025-47812 · Published 10 Jul 2025 ]

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

Exploited · CISA KEV CVSS 10.0 EPSS 94%No fix listed yet

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-07-14
  • EPSS: 94% chance of exploitation in the next 30 days (higher than 100% of CVEs)
  • Critical severity: CVSS 10.0

[ Description ]Official 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). This is thus a remote code execution vulnerability that guarantees a total server compromise. This is also exploitable via anonymous FTP accounts.

CISA: 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).

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 4 Aug 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References