CVE-2020-37209 in Nsauditor SpotFTP FTP Password Recovery
Summary
by MITRE • 02/11/2026
SpotFTP 3.0.0.0 contains a denial of service vulnerability in the registration name input field that allows attackers to crash the application. Attackers can generate a 1000-character buffer payload and paste it into the 'Name' field to trigger an application crash.
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Analysis
by VulDB Data Team • 02/21/2026
The vulnerability identified as CVE-2020-37209 affects SpotFTP version 3.0.0.0 and represents a classic buffer overflow condition within the application's registration name input handling mechanism. This type of vulnerability falls under the broader category of improper input validation flaws that can lead to system instability and potential exploitation. The specific implementation flaw occurs when the application processes user input in the registration name field without adequate bounds checking or sanitization measures. The vulnerability is particularly concerning because it can be exploited through a relatively simple attack vector involving a 1000-character payload that triggers an application crash. This denial of service condition effectively prevents legitimate users from utilizing the registration functionality of the software, thereby disrupting normal operational procedures.
The technical execution of this vulnerability demonstrates a fundamental lack of input validation controls within the SpotFTP application framework. When an attacker inputs a 1000-character string into the Name field, the application fails to properly handle this excessive input length, resulting in a buffer overflow condition that causes the application to terminate unexpectedly. This behavior aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a clear violation of secure coding practices. The vulnerability's exploitability is enhanced by the fact that it requires minimal technical skill to execute, making it particularly dangerous in environments where unauthorized users may have access to the application interface. The application's failure to implement proper input length restrictions and memory management protocols creates an exploitable condition that directly impacts the software's availability and reliability.
From an operational perspective, this denial of service vulnerability significantly impacts the availability of the SpotFTP registration service and can potentially disrupt business operations that depend on the application's functionality. The impact extends beyond simple application instability as it can affect user confidence and trust in the software's reliability. Organizations relying on SpotFTP for their file transfer operations may experience service interruptions when attackers exploit this vulnerability, potentially leading to productivity losses and increased support overhead. The vulnerability also represents a potential precursor to more sophisticated attacks, as denial of service conditions can often be used as distractions while attackers pursue other exploitation objectives. This type of vulnerability can be particularly problematic in enterprise environments where multiple users may be attempting to register or access the system simultaneously, amplifying the impact of the denial of service condition.
Mitigation strategies for CVE-2020-37209 should focus on implementing robust input validation and bounds checking mechanisms within the application's registration process. The most effective immediate solution involves updating the SpotFTP application to a version that properly handles input length restrictions and implements proper buffer management techniques. Organizations should also consider implementing network-based controls such as input filtering at proxy or firewall levels to prevent overly long payloads from reaching the vulnerable application. Additionally, application developers should adopt secure coding practices including input length validation, buffer size checking, and proper error handling mechanisms to prevent similar vulnerabilities from occurring in future versions. The implementation of these mitigations aligns with ATT&CK tactic TA0043, which covers resource development and defense evasion techniques, and addresses the fundamental security weaknesses that enable this type of denial of service exploitation. Regular security assessments and code reviews should be conducted to identify and remediate similar input validation vulnerabilities across the entire software ecosystem.