Historical catalog analysis: CISA added this entry on March 16, 2026. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2025-47813 is an information disclosure vulnerability (CWE-209) affecting Wing FTP Server. The flaw occurs when the server processes a UID cookie containing an excessively long value, resulting in the generation of error messages that reveal sensitive information.
Exposure and applicability
This vulnerability applies to organizations deploying Wing FTP Server. The exposure path is centered on the handling of the UID cookie; if an attacker or unauthorized user can provide a specifically crafted long value within this cookie, they may trigger the disclosure of internal system data via error responses. Infrastructure owners should identify all instances of Wing FTP Server across their environment to determine the scope of applicability.
Remediation priorities
Based on our analysis, remediation should be prioritized for internet-facing FTP servers where the UID cookie is processed. We recommend the following actions:
- Apply Vendor Mitigations: The primary corrective action is to implement the mitigations provided in the vendor’s server history documentation. This is the most direct method to address the root cause of the error generation.
- Cloud Service Alignment: For organizations utilizing this software within cloud environments, we recommend aligning remediation efforts with BOD 22-01 guidance to ensure consistent exposure reduction across distributed assets.
- Decommissioning: In scenarios where vendor mitigations cannot be applied or are unavailable for a specific deployment version, the product should be discontinued to eliminate the risk of information disclosure.
How to validate remediation
Verification must go beyond confirming a software version number. To ensure that exposure has been reduced, defenders should verify that the system no longer generates sensitive error messages when presented with long values in the UID cookie.
Validation evidence should consist of logs or response captures demonstrating that the server now handles oversized cookies gracefully (e.g., by returning a generic error or rejecting the request) without leaking internal system details. A successful validation is one where the specific information disclosure behavior described in CVE-2025-47813 is no longer observable.
Limits and open questions
While applying vendor mitigations reduces the likelihood of this specific disclosure, residual risk remains regarding other potential inputs that might trigger similar error-handling flaws. It is currently unknown whether this vulnerability has been leveraged in ransomware campaigns. Furthermore, while CISA has established a remediation deadline of March 30, 2026, for federal agencies, non-federal organizations must determine their own deadlines based on their internal risk tolerance and asset criticality.
Source and editorial note
CVE-2025-47813: Wing FTP Server Information Disclosure Vulnerability · Source date: March 16, 2026 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: March 19, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 18, 2026 at 00:27 UTC.
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