CVE-2019-25334 in Nsauditor Product Key Explorer
Summary
by MITRE • 02/13/2026
Product Key Explorer 4.2.0.0 contains a denial of service vulnerability that allows local attackers to crash the application by overflowing the registration name input field. Attackers can create a specially crafted text file with repeated characters to trigger a buffer overflow when pasted into the registration name field, causing the application to crash.
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Analysis
by VulDB Data Team • 03/26/2026
The vulnerability identified as CVE-2019-25334 represents a critical buffer overflow flaw in Product Key Explorer version 4.2.0.0 that exposes the application to denial of service attacks. This vulnerability specifically targets the registration name input field, creating a pathway for local attackers to exploit the software through carefully crafted malicious input. The flaw demonstrates a classic insufficient input validation issue that has been documented in numerous security frameworks including CWE-121, which categorizes buffer overflow conditions as a fundamental weakness in software design that can lead to arbitrary code execution or system instability.
The technical implementation of this vulnerability involves the application's failure to properly validate or limit the length of input data entered into the registration name field. When attackers supply a specially crafted text file containing repeated characters, the application processes this input without adequate bounds checking, leading to memory corruption that ultimately results in application crash. This behavior aligns with CWE-787, which describes out-of-bounds write conditions that occur when an application writes data past the end of a buffer, causing system instability and potential exploitation. The vulnerability is particularly concerning because it requires minimal technical expertise to exploit, making it accessible to attackers with basic knowledge of input manipulation techniques.
From an operational perspective, this denial of service vulnerability significantly impacts the reliability and availability of the Product Key Explorer application. Local attackers can consistently disrupt the software's functionality by simply pasting malicious input into the registration field, effectively rendering the application unusable until manually restarted or the system is rebooted. The vulnerability's local attack surface means that any user with access to the system can potentially exploit it, creating a significant risk for environments where multiple users share the same machine or where the application is used in automated processes. This type of vulnerability also provides a potential foothold for more sophisticated attacks, as demonstrated by ATT&CK technique T1499.004 which covers network denial of service attacks that can be initiated through application-level vulnerabilities.
The exploitation of this vulnerability can be mitigated through several defensive measures that align with established security best practices. Software vendors should implement proper input validation and length restriction mechanisms to prevent buffer overflows from occurring in the first place, which directly addresses CWE-129 and CWE-131 categories that emphasize the importance of input sanitization. Additionally, implementing stack canaries, address space layout randomization, and other exploit mitigation techniques can make successful exploitation more difficult even if the underlying buffer overflow persists. Regular security updates and patches should be deployed immediately to address this vulnerability, as the flaw exists in the application's core input handling logic and cannot be resolved through configuration changes alone. Organizations should also consider implementing application whitelisting policies that restrict the execution of untrusted software, thereby limiting the potential attack surface for this type of vulnerability. The vulnerability's classification as a local denial of service makes it particularly important to maintain proper access controls and user privilege management to prevent unauthorized exploitation of the system.