CVE-2020-37206 in Nsauditor ShareAlarmPro Advanced Network Access Control
Summary
by MITRE • 02/11/2026
ShareAlarmPro contains a denial of service vulnerability that allows attackers to crash the application by supplying an oversized registration key. Attackers can generate a 1000-character buffer payload to trigger an application crash when pasted into the registration key field.
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Analysis
by VulDB Data Team • 06/29/2026
The vulnerability identified as CVE-2020-37206 represents a classic buffer overflow condition within the ShareAlarmPro application that manifests as a denial of service attack vector. This flaw exists in the application's input validation mechanisms for registration key processing, where the software fails to properly handle oversized input data. The vulnerability specifically affects the registration key field, which serves as the primary interface for user authentication and software activation within the application. When an attacker supplies a registration key exceeding the expected buffer size, the application's memory management routines become overwhelmed, leading to an abrupt termination of the process.
The technical exploitation of this vulnerability follows a straightforward methodology that aligns with common software security weaknesses classified under CWE-121. The flaw stems from inadequate bounds checking during string processing operations, where the application allocates a fixed-size buffer to accommodate registration keys but does not validate the length of incoming data. This allows attackers to overflow the allocated memory space, causing unpredictable behavior including application crashes. The specific payload size of 1000 characters demonstrates that the buffer allocation is insufficient to handle legitimate registration key lengths, while also providing enough data to trigger the overflow condition. The vulnerability operates at the application layer and does not require elevated privileges to exploit, making it particularly dangerous as it can be triggered through simple user interaction.
From an operational impact perspective, this denial of service vulnerability significantly compromises the availability of the ShareAlarmPro application and affects legitimate users who may inadvertently trigger the crash or face deliberate attacks. The application crash results in complete service disruption, forcing users to restart the software and potentially lose unsaved data or progress. This vulnerability directly impacts the software's reliability and user experience, as the application becomes temporarily unusable until manually restarted by the user. The attack surface is minimal and accessible through standard user interface interactions, making it an attractive target for adversaries seeking to disrupt service availability. The vulnerability's impact extends beyond individual user inconvenience to potentially affect business operations if the application is critical to organizational workflows.
Mitigation strategies for CVE-2020-37206 should focus on implementing robust input validation and buffer management practices within the ShareAlarmPro application. The most effective approach involves modifying the software to enforce strict bounds checking on registration key inputs, ensuring that all incoming data is validated against predetermined maximum length limits. This aligns with defensive programming principles and addresses the root cause of the vulnerability rather than merely patching symptoms. The implementation should include proper memory allocation techniques that prevent buffer overflows and incorporate defensive mechanisms such as stack canaries or address space layout randomization. Additionally, the application should implement graceful error handling that prevents crashes when encountering malformed input data, instead returning appropriate error messages to users without terminating the process. Security updates and patches should be deployed immediately to address this vulnerability, as the flaw represents a clear violation of secure coding practices and exposes the application to potential exploitation by malicious actors. The vulnerability's classification under ATT&CK technique T1499.004 for network denial of service further emphasizes the need for comprehensive mitigation strategies that protect against both accidental and intentional exploitation of the flaw.