CVE-2025-47812

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

As of , CVE-2025-47812 in Wing FTP Server is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 14 July 2025
US federal deadline
4 August 202521 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.93Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
Public exploit
2 Metasploit modules and 1 Exploit-DB entry
Fix
Vendor advice: www.wftpserver.comLinks below, from CISA's entry.

What CISA says to do

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's required action

What the flaw 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).

CISA's 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.

The CVE record's description, from mitre

CVE published
10 July 2025
Assigned by
mitre
CVSS
10.0 Critical (CVSS 3.1, from the CNA)
CWE-158
Improper Neutralization of Null Byte or NUL Character
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
total

Timeline

  1. Exploit-DB published an exploit (EDB-ID 52347).
  2. The CVE record was published.
  3. CISA added it to its list of exploited vulnerabilities.
  4. The US federal deadline to fix it.

Public exploits

Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.

Wing FTP Server: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2025-47813Information DisclosureWing FTP Server Wing FTP ServerPatch this weekEPSS 0.630.63

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