CVE-2020-37209 Overview
CVE-2020-37209 is a denial of service vulnerability in Nsasoft SpotFTP 3.0.0.0, an FTP password recovery utility. The flaw resides in the registration name input field. An attacker who pastes a 1000-character payload into the Name field can crash the application. The issue is categorized under CWE-120, Buffer Copy without Checking Size of Input. Exploitation requires local access and user interaction with the registration dialog. The vulnerability does not provide code execution or data exposure based on available reporting; impact is limited to application availability.
Critical Impact
A local attacker can crash SpotFTP 3.0.0.0 by submitting an oversized string to the registration Name field, disrupting use of the FTP password recovery tool.
Affected Products
- Nsasoft SpotFTP 3.0.0.0
- CPE: cpe:2.3:a:nsasoft:spotftp:3.0.0.0:*:*:*:*:*:*:*
- Vendor: Nsasoft (nsauditor.com)
Discovery Timeline
- 2026-02-11 - CVE-2020-37209 published to NVD
- 2026-02-20 - Last updated in NVD database
Technical Details for CVE-2020-37209
Vulnerability Analysis
SpotFTP 3.0.0.0 exposes a registration dialog that accepts user-supplied input through a Name field. The application copies the input into a fixed-size buffer without validating its length. A 1000-character string exceeds the allocated buffer, corrupts adjacent memory, and terminates the process. Available reporting describes the outcome as a crash rather than reliable code execution. The defect is classified as [CWE-120], a classic buffer copy without bounds checking. The local attack vector and required user interaction constrain real-world exploitation to scenarios where an attacker can either operate the application or convince a local user to paste the payload.
Root Cause
The registration handler does not enforce a maximum input length on the Name field before copying data into a stack or heap buffer. Length validation, safe string APIs, or bounded copies would prevent the overflow condition.
Attack Vector
Exploitation is local and requires user interaction. An attacker generates a 1000-character buffer, opens SpotFTP, navigates to the registration dialog, and pastes the payload into the Name field. Submitting the form triggers the buffer overflow and crashes the application. No network exposure exists and no authentication bypass is required. Public proof-of-concept material is referenced in Exploit-DB #47868 and the VulnCheck Advisory on SpotFTP.
Detection Methods for CVE-2020-37209
Indicators of Compromise
- Unexpected termination of SpotFTP.exe on a host running version 3.0.0.0.
- Windows Application event log entries showing access violations or faulting modules tied to the SpotFTP process.
- Crash dump artifacts in %LOCALAPPDATA%\CrashDumps referencing SpotFTP.
Detection Strategies
- Inventory endpoints for installations of Nsasoft SpotFTP 3.0.0.0 using software asset management tooling.
- Monitor for Windows Error Reporting (WER) events (Event ID 1000/1001) where the faulting application is SpotFTP.
- Alert on process termination patterns where SpotFTP crashes shortly after user interaction with the registration UI.
Monitoring Recommendations
- Forward Windows Application and WER logs to a centralized log platform for correlation.
- Track installation and execution of legacy or unsupported FTP password recovery utilities on managed endpoints.
- Review user reports of repeated SpotFTP crashes, which may indicate testing or exploitation attempts.
How to Mitigate CVE-2020-37209
Immediate Actions Required
- Remove or block execution of Nsasoft SpotFTP 3.0.0.0 on managed endpoints until a vendor fix is confirmed.
- Restrict the use of FTP password recovery tools to authorized administrators on isolated systems.
- Apply application allowlisting to prevent unauthorized launch of SpotFTP.exe.
Patch Information
No vendor advisory or patched version is referenced in the available data. Consult the VulnCheck Advisory on SpotFTP and the vendor site at nsauditor.com for updates. If no fixed release is published, treat the application as unsupported and plan for replacement.
Workarounds
- Uninstall SpotFTP 3.0.0.0 and migrate to a maintained FTP credential recovery solution.
- Run SpotFTP only inside a non-privileged, isolated virtual machine where a crash has no downstream impact.
- Train users not to paste untrusted data into the registration Name field.
- Enforce least privilege so that local users cannot install legacy utilities outside policy.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
