Cyber Resilience

CVE-2025-27889

Wftpserver Wing Ftp Server ≤ 7.4.4

Public PoC
Published
10 July 2025
Modified
17 June 2026
CVSS Score v3.1 3.4
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
EPSS Score 0.0041 34th percentile
Risk Priority 31 floored blend · peak EPSS

Summary

CVE-2025-27889 is a low-severity External Control of System or Configuration Setting (CWE-15) vulnerability in Wftpserver Wing Ftp Server. Its CVSS base score is 3.4 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception by PATH Environment Variable (T1574.007); ranked at the 34th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and AC-6 (Least Privilege) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2025-27889 affects Wing FTP Server versions prior to 7.4.4, stemming from improper validation and sanitization of the "url" parameter in the downloadpass.html endpoint (CWE-15). This flaw enables attackers to inject arbitrary links into responses. The vulnerability carries a CVSS v3.1 base score of 3.4 (AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N), rated as low severity due to its reliance on user interaction and limited impact scope.

Exploitation requires no privileges and can occur over the network, but demands high attacker effort and user interaction. An attacker crafts a malicious link targeting the vulnerable endpoint and tricks a legitimate user—such as an administrator—into clicking it. Successful interaction results in the disclosure of a cleartext password to the attacker, potentially enabling further unauthorized access to FTP resources or accounts.

Advisories, including the vendor's site at wftpserver.com and a detailed GitHub advisory, recommend upgrading to Wing FTP Server 7.4.4 or later to mitigate the issue by addressing the parameter validation flaw. No workarounds are specified in available references.

OWASP Top 10 for Web (2025)

A02:2025 Security Misconfiguration

EU & UK References

Vulnerability Data

Wing FTP Server before 7.4.4 does not properly validate and sanitize the url parameter of the downloadpass.html endpoint, allowing injection of an arbitrary link. If a user clicks a crafted link, this discloses a cleartext password to the attacker.

CWE(s)
CWE-15

Related Threats

MITRE ATT&CK Enterprise Techniques

T1574.007 Path Interception by PATH Environment Variable Stealth
Adversaries may execute their own malicious payloads by hijacking environment variables used to load libraries.
attack.mitre.org →
T1547.004 Winlogon Helper DLL Persistence
Adversaries may abuse features of Winlogon to execute DLLs and/or executables when a user logs in.
attack.mitre.org →
T1547.014 Active Setup Persistence
Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.
attack.mitre.org →
T1574 Hijack Execution Flow Stealth
Adversaries may execute their own malicious payloads by hijacking the way operating systems run programs.
attack.mitre.org →
T1574.006 Dynamic Linker Hijacking Stealth
Adversaries may execute their own malicious payloads by hijacking environment variables the dynamic linker uses to load shared libraries.
attack.mitre.org →
T1574.012 COR_PROFILER Stealth
Adversaries may leverage the COR_PROFILER environment variable to hijack the execution flow of programs that load the .
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-37878Same product: Wftpserver Wing Ftp Server
CVE-2025-47811Same product: Wftpserver Wing Ftp Server
CVE-2023-37881Same product: Wftpserver Wing Ftp Server
CVE-2019-25267Same product: Wftpserver Wing Ftp Server
CVE-2025-47812Same product: Wftpserver Wing Ftp Server
CVE-2025-5196Same product: Wftpserver Wing Ftp Server
CVE-2023-37875Same product: Wftpserver Wing Ftp Server
CVE-2025-47813Same product: Wftpserver Wing Ftp Server
CVE-2023-37879Same product: Wftpserver Wing Ftp Server
CVE-2026-44403Same product: Wftpserver Wing Ftp Server

Affected Assets

wftpserver
wing ftp server
≤ 7.4.4

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 4 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

Enforces approved authorizations for logical access to configuration resources so external parties cannot alter them.

CM-5 Access Restrictions for Change good match

Enforces documented access restrictions on all changes to system configuration, directly blocking unauthorized external control of settings.

AC-6 Least Privilege good match

Limits privileges to the minimum needed, reducing the set of users who can externally modify configuration.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-01 mostly match
prevents

Hardened configuration baselines and change controls directly limit external manipulation of settings.

ID.RA-07 partial match
prevents

Formal change and exception management catches externally driven configuration alterations.

PR.AA-05 partial match
prevents

Least-privilege access policies reduce unauthorized external modification of configuration values.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.9 Configuration management full match
degrades

Configuration management directly prevents external tampering with system settings.

A.5.18 Access rights mostly match
prevents

Access rights assignment determines who may change system settings.

A.8.2 Privileged access rights mostly match
prevents

Privileged access rights reduce the number of users who can alter configuration.

A.8.3 Information access restriction mostly match
prevents

Information access restriction limits who can view or modify configuration data.

A.8.32 Change management mostly match
prevents

Change management enforces controlled, authorized modifications to settings.

A.5.15 Access control partial match
prevents

Access control policies underpin the technical restrictions on configuration changes.

References