CVE-2025-21067 in Notes
Summary
by MITRE • 10/10/2025
Out-of-bounds read in the allocation of image buffer in Samsung Notes prior to version 4.4.30.63 allows local attackers to access out-of-bounds memory.
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Analysis
by VulDB Data Team • 10/16/2025
The vulnerability identified as CVE-2025-21067 represents a critical out-of-bounds read condition within Samsung Notes application's image buffer allocation mechanism. This flaw exists in versions prior to 4.4.30.63 and specifically affects the memory management processes when handling image data within the note-taking application. The vulnerability stems from inadequate bounds checking during the allocation and processing of image buffers, creating a scenario where the application attempts to read memory locations beyond the allocated buffer boundaries. This type of vulnerability falls under the CWE-129 category of Improper Validation of Array Index, which is a fundamental weakness in input validation that allows attackers to manipulate memory access patterns.
The technical execution of this vulnerability occurs when Samsung Notes processes image data within notes, particularly when handling various image formats or when performing operations such as image resizing, editing, or rendering. Attackers can exploit this by crafting malicious image files or manipulating the application's image processing pipeline to trigger the out-of-bounds memory read. The operational impact of this vulnerability extends beyond simple data exposure, as it could potentially allow attackers to access sensitive information stored in adjacent memory locations, including application state data, user credentials, or other confidential information. This vulnerability aligns with ATT&CK technique T1068 which describes the use of local privileges to execute malicious code through application flaws, and T1555 which covers data harvesting through memory access manipulation.
The exploitation of CVE-2025-21067 requires local system access and presents a significant risk to user privacy and data integrity within the Samsung Notes environment. Attackers could potentially leverage this vulnerability to extract sensitive information from the application's memory space, which might include user notes, personal data, or even authentication tokens that could be used for further exploitation. The vulnerability's impact is particularly concerning because Samsung Notes is a widely used application for personal and professional note-taking, making it a prime target for adversaries seeking to access confidential information. Organizations and individual users should immediately update to version 4.4.30.63 or later to mitigate this risk, as the fix typically includes proper bounds checking mechanisms and memory validation procedures that prevent unauthorized memory access patterns. The vulnerability demonstrates the importance of robust input validation and memory management practices in mobile applications, particularly those handling user-generated content such as images and multimedia data.
The remediation approach for CVE-2025-21067 involves implementing comprehensive bounds checking mechanisms during image buffer allocation and processing operations. Security patches for this vulnerability typically include enhanced validation of buffer sizes, proper memory allocation procedures, and strict enforcement of array index boundaries. Organizations should conduct thorough security assessments of their mobile application environments and ensure that all Samsung Notes installations are updated to the patched version. Additionally, implementing runtime monitoring and memory protection mechanisms can provide additional defense-in-depth measures against similar vulnerabilities. The vulnerability serves as a reminder of the critical importance of secure coding practices and regular security updates in mobile applications that handle user data and multimedia content.