CVE-2019-25469 in Folder Lock
Summary
by MITRE • 03/11/2026
Folder Lock 7.7.9 contains a buffer overflow vulnerability in the serial number registration field that allows local attackers to crash the application by submitting an oversized payload. Attackers can paste a 6000-byte buffer of arbitrary data into the 'Serial Number and Registration Key' field to trigger a denial of service condition.
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Analysis
by VulDB Data Team • 03/14/2026
The vulnerability identified as CVE-2019-25469 represents a critical buffer overflow flaw within Folder Lock version 7.7.9 that specifically targets the serial number registration functionality. This issue resides in the application's input validation mechanisms where the software fails to properly sanitize or limit the length of data submitted through the serial number and registration key field. The vulnerability manifests when an attacker provides an oversized payload of 6000 bytes, which exceeds the allocated buffer space and causes the application to crash or terminate unexpectedly. This type of vulnerability falls under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions that occur when insufficient bounds checking is performed on buffers, leading to memory corruption and application instability.
The technical exploitation of this vulnerability demonstrates a classic stack-based buffer overflow scenario where the application's registration interface does not implement proper input length validation. When the 6000-byte payload is processed through the serial number field, the program attempts to copy this data into a buffer that cannot accommodate such a large amount of information, resulting in memory corruption that ultimately leads to application termination. The local attack vector indicates that exploitation requires physical access or the ability to execute code on the target system, making this vulnerability particularly concerning for environments where unauthorized local access might occur. This flaw represents a failure in the software's defensive programming practices and highlights the importance of implementing proper input validation and bounds checking mechanisms.
The operational impact of this vulnerability extends beyond simple denial of service conditions as it can potentially be leveraged to disrupt legitimate user operations and create service availability issues for the affected system. When the application crashes due to buffer overflow conditions, users lose access to the folder locking functionality, which may result in data security compromise if users are forced to restart the application or if the crash occurs during critical operations. The vulnerability affects the application's reliability and can be particularly problematic in enterprise environments where Folder Lock might be used for critical data protection tasks. From a security perspective, while this vulnerability does not appear to allow for arbitrary code execution, the denial of service condition can serve as a precursor to more sophisticated attacks or can be used to create distractions during other security operations.
Mitigation strategies for CVE-2019-25469 should prioritize immediate software updates from the vendor to address the buffer overflow condition through proper input validation and bounds checking. System administrators should implement network segmentation and access controls to limit local system access where possible, reducing the attack surface for local exploitation. Additionally, monitoring for unusual application crashes or abnormal behavior in the Folder Lock service should be implemented as part of security operations. The vulnerability's classification under ATT&CK technique T1499.004 for network denial of service highlights the importance of maintaining application stability and implementing proper error handling mechanisms. Organizations should also consider implementing application whitelisting policies to restrict execution of unpatched versions and establish incident response procedures to address potential exploitation attempts. The fundamental requirement for preventing such vulnerabilities involves implementing secure coding practices that include proper input validation, memory management, and robust error handling mechanisms that align with industry standards for secure software development practices.