Executive Summary
In July 2025, a medium-severity information disclosure vulnerability, identified as CVE-2025-47813, was discovered in Wing FTP Server versions 7.4.3 and earlier. This flaw allowed unauthenticated attackers to obtain sensitive information about the server's local file system by exploiting the 'loginok.html' page with a specially crafted UID cookie. The vulnerability was addressed in version 7.4.4, released on May 14, 2025. Despite the availability of a patch, many systems remained unpatched, leaving them susceptible to potential exploitation.
The incident underscores the critical importance of timely software updates and robust vulnerability management practices. Organizations are urged to prioritize the remediation of known vulnerabilities to mitigate the risk of unauthorized access and data breaches.
Why This Matters Now
The CVE-2025-47813 vulnerability in Wing FTP Server highlights the ongoing risks associated with unpatched software. With active exploitation observed, it is imperative for organizations to update their systems promptly to prevent potential data breaches and maintain operational security.
Attack Path Analysis
An attacker exploited an information disclosure vulnerability in Wing FTP Server to obtain the server's installation path. Using this information, they escalated privileges by exploiting a remote code execution flaw, allowing them to execute commands as the system user. The attacker then moved laterally within the network by transferring tools to other systems. They established command and control by creating a reverse shell connection to an external server. Subsequently, they exfiltrated sensitive data by copying files to an external FTP server. Finally, the attacker deployed ransomware, encrypting critical files and disrupting business operations.
Kill Chain Progression
Initial Compromise
Description
The attacker exploited CVE-2025-47813 in Wing FTP Server to disclose the full local installation path by sending a specially crafted UID cookie with an excessively long value.
Related CVEs
CVE-2025-47813
CVSS 4.3loginok.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.
Affected Products:
wftpserver Wing FTP Server – < 7.4.4
Exploit Status:
exploited in the wild
MITRE ATT&CK® Techniques
Gather Victim Host Information
Active Scanning
Exploit Public-Facing Application
File and Directory Discovery
Network Service Scanning
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
PCI DSS 4.0 – Ensure all system components and software are protected from known vulnerabilities
Control ID: 6.2
NYDFS 23 NYCRR 500 – Cybersecurity Policy
Control ID: 500.03
DORA – ICT Risk Management Framework
Control ID: Article 5
CISA ZTMM 2.0 – Asset Management
Control ID: Pillar 1: Identity
NIS2 Directive – Cybersecurity Risk Management Measures
Control ID: Article 21
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Information Technology/IT
Wing FTP Server vulnerability enables information disclosure affecting IT infrastructure. Requires immediate patching of file transfer systems and encrypted traffic security controls.
Financial Services
Information disclosure vulnerability threatens sensitive financial data in transit. PCI compliance mandates and encrypted traffic capabilities critical for secure file transfers.
Health Care / Life Sciences
HIPAA-regulated organizations face patient data exposure risks through FTP servers. Zero trust segmentation and egress security essential for compliance protection.
Government Administration
Federal agencies must remediate CVE-2025-47813 per BOD 22-01 requirements. Information disclosure poses significant risks to classified and sensitive government data.
Sources
- CISA Adds One Known Exploited Vulnerability to Cataloghttps://www.cisa.gov/news-events/alerts/2026/03/16/cisa-adds-one-known-exploited-vulnerability-catalogVerified
- NVD - CVE-2025-47813https://nvd.nist.gov/vuln/detail/CVE-2025-47813Verified
- Vulnerability Summary for the Week of July 7, 2025 | CISAhttps://www.cisa.gov/news-events/bulletins/sb25-195Verified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Aviatrix Zero Trust CNSF is pertinent to this incident as it could have limited the attacker's ability to move laterally and exfiltrate data by enforcing strict segmentation and controlled egress policies.
Control: Cloud Native Security Fabric (CNSF)
Mitigation: The attacker's ability to exploit the vulnerability may have been constrained by limiting unauthorized access to sensitive system information.
Control: Zero Trust Segmentation
Mitigation: The attacker's ability to escalate privileges could have been limited by enforcing strict segmentation policies that restrict access to critical system components.
Control: East-West Traffic Security
Mitigation: The attacker's lateral movement within the network would likely have been constrained by monitoring and controlling east-west traffic.
Control: Multicloud Visibility & Control
Mitigation: The attacker's ability to establish command and control channels may have been limited by comprehensive monitoring and control over network traffic.
Control: Egress Security & Policy Enforcement
Mitigation: The attacker's data exfiltration efforts would likely have been constrained by enforcing strict egress policies.
The attacker's ability to deploy ransomware may have been limited by prior segmentation and traffic controls, reducing the scope of impact.
Impact at a Glance
Affected Business Functions
- File Transfer Services
- Data Storage Management
Estimated downtime: N/A
Estimated loss: N/A
Potential disclosure of system paths and configurations.
Recommended Actions
Key Takeaways & Next Steps
- • Implement Zero Trust Segmentation to restrict access between systems and limit lateral movement.
- • Deploy Inline IPS (Suricata) to detect and prevent exploitation attempts of known vulnerabilities.
- • Utilize Threat Detection & Anomaly Response systems to identify and respond to unusual activities promptly.
- • Enforce Egress Security & Policy Enforcement to control outbound traffic and prevent unauthorized data exfiltration.
- • Ensure all systems are updated to the latest versions to mitigate known vulnerabilities.
