CVE-2025-47813

MediumCISA KEVActive ExploitationPublic PoC

Published: 10 July 2025

Published

10 July 2025

Modified

16 March 2026

KEV Added

16 March 2026

Patch

—

CVSS Score 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Score 0.2692 96.4th percentile

Risk Priority 45 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-47813 is a medium-severity Generation of Error Message Containing Sensitive Information (CWE-209) vulnerability in Wftpserver Wing Ftp Server. Its CVSS base score is 4.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique File and Directory Discovery (T1083); ranked in the top 3.6% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-11 (Error Handling).

Threat & Defense at a Glance

What attackers do: exploitation maps to File and Directory Discovery (T1083) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-11 Error Handling good match

prevent

SI-11 ensures error handling prevents uncontrolled leaks of sensitive information like installation paths triggered by malformed long UID cookies.

SI-10 Information Input Validation good match

prevent

SI-10 validates inputs such as excessively long UID cookies to block exploitation attempts before processing.

SI-15 Information Output Filtering good match

prevent

SI-15 filters sensitive information like server paths from HTML outputs generated by loginok.html.

MITRE ATT&CK Enterprise TechniquesAI

T1083 File and Directory Discovery Discovery

Adversaries may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system.

attack.mitre.org →

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

CVE-2025-47813 discloses the application's local installation path via long UID cookie, enabling File and Directory Discovery (T1083). The advisory describes a related pre-auth NULL byte authentication bypass in the same component leading to RCE, facilitating Exploitation of Public-Facing Application (T1190).

NVD Description

loginok.html in Wing FTP Server before 7.4.4 discloses the full local installation path of the application when using a long value in the UID cookie.

Deeper analysisAI

CVE-2025-47813 is an information disclosure vulnerability (CWE-209) affecting the loginok.html component in Wing FTP Server versions prior to 7.4.4. When a long value is supplied in the UID cookie, the application exposes its full local installation path. Published on 2025-07-10, the vulnerability carries a CVSS v3.1 base score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N), indicating moderate severity primarily due to limited confidentiality impact.

An authenticated attacker with low privileges (PR:L) can exploit this over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). By sending a specially crafted request to loginok.html containing an excessively long UID cookie value, the attacker retrieves the server's complete installation path, enabling reconnaissance that could facilitate further attacks such as path traversal or privilege escalation when chained with other flaws.

Mitigation involves upgrading to Wing FTP Server 7.4.4 or later, as indicated by the affected version range in the CVE description. Vendor guidance is available at wftpserver.com, with additional details in advisories like the GitHub entry from MrTuxracer.

This CVE appears in the CISA Known Exploited Vulnerabilities Catalog and relates to other Wing FTP Server issues, including CVE-2025-47812 (an RCE), as covered by RCEsecurity.